Fix failing doc tests

[morgsmccauley]

Tests will now be run against PRs, but we had to disable doctest in order to make them pass. This should ideally be fixed so we can reenable them.

Here are the current failures

---- src/lib.rs - (line 115) stdout ----
error: expected expression, found `$`
 --> src/lib.rs:116:1
  |
3 | $ export AWS_ACCESS_KEY_ID=AKIAIOSFODNN7EXAMPLE
  | ^ expected expression

error: aborting due to previous error

Couldn't compile the test.
---- src/lib.rs - (line 103) stdout ----
error: expected `;`, found `aws_access_key_id`
 --> src/lib.rs:104:10
  |
3 | [default]
  |          ^ help: add `;` here
4 | aws_access_key_id=AKIAIOSFODNN7EXAMPLE
  | ----------------- unexpected token

error: expected `;`, found `aws_secret_access_key`
 --> src/lib.rs:105:39
  |
4 | aws_access_key_id=AKIAIOSFODNN7EXAMPLE
  |                                       ^ help: add `;` here
5 | aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
  | --------------------- unexpected token

error[E0425]: cannot find value `aws_secret_access_key` in this scope
 --> src/lib.rs:106:1
  |
5 | aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
  | ^^^^^^^^^^^^^^^^^^^^^
  |
help: you might have meant to introduce a new binding
  |
5 | let aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
  | +++

error[E0425]: cannot find value `wJalrXUtnFEMI` in this scope
 --> src/lib.rs:106:23
  |
5 | aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
  |                       ^^^^^^^^^^^^^ not found in this scope

error[E0425]: cannot find value `K7MDENG` in this scope
 --> src/lib.rs:106:37
  |
5 | aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
  |                                     ^^^^^^^ not found in this scope

error[E0425]: cannot find value `bPxRfiCYEXAMPLEKEY` in this scope
 --> src/lib.rs:106:45
  |
5 | aws_secret_access_key=wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY
  |                                             ^^^^^^^^^^^^^^^^^^ not found in this scope

error: aborting due to 6 previous errors

For more information about this error, try `rustc --explain E0425`.
Couldn't compile the test.
---- src/types.rs - types::LakeConfigBuilder::mainnet (line 61) stdout ----
error[E0752]: `main` function is not allowed to be `async`
 --> src/types.rs:64:1
  |
5 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0752`.
Couldn't compile the test.
---- src/lib.rs - streamer (line 241) stdout ----
error[E0596]: cannot borrow `stream` as mutable, as it is not declared as mutable
  --> src/lib.rs:254:40
   |
13 |     let (_, stream) = near_lake_framework::streamer(config);
   |             ------ help: consider changing this to be mutable: `mut stream`
14 |
15 |     while let Some(streamer_message) = stream.recv().await {
   |                                        ^^^^^^^^^^^^^ cannot borrow as mutable

error[E0752]: `main` function is not allowed to be `async`
 --> src/lib.rs:245:1
  |
6 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0596, E0752.
For more information about an error, try `rustc --explain E0596`.
Couldn't compile the test.
---- src/types.rs - types::LakeConfigBuilder::betanet (line 97) stdout ----
error[E0752]: `main` function is not allowed to be `async`
 --> src/types.rs:100:1
  |
5 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0752`.
Couldn't compile the test.
---- src/types.rs - types::LakeConfig (line 7) stdout ----
error[E0752]: `main` function is not allowed to be `async`
 --> src/types.rs:10:1
  |
5 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0752`.
Couldn't compile the test.
---- src/lib.rs - (line 73) stdout ----
error[E0752]: `main` function is not allowed to be `async`
 --> src/lib.rs:76:1
  |
5 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0752`.
Couldn't compile the test.
---- src/lib.rs - (line 7) stdout ----
error[E0308]: mismatched types
   --> src/lib.rs:33:4
    |
7   |   async fn main() -> Result<(), tokio::io::Error> {
    |                      ---------------------------- expected `Result<(), std::io::Error>` because of return type
...
28  | /    match sender.await {
29  | |        Ok(Ok(())) => Ok(()),
30  | |        Ok(Err(e)) => Err(e),
31  | |        Err(e) => Err(anyhow::Error::from(e)), // JoinError
32  | |    }
    | |____^ expected struct `std::io::Error`, found struct `anyhow::Error`
    |
    = note: struct `anyhow::Error` and struct `std::io::Error` have similar names, but are actually distinct types
note: struct `anyhow::Error` is defined in crate `anyhow`
   --> /Users/morganmccauley/.cargo/registry/src/github.com-1ecc6299db9ec823/anyhow-1.0.65/src/lib.rs:371:1
    |
371 | pub struct Error {
    | ^^^^^^^^^^^^^^^^
note: struct `std::io::Error` is defined in crate `std`
   --> /Users/morganmccauley/.rustup/toolchains/1.67-aarch64-apple-darwin/lib/rustlib/src/rust/library/std/src/io/error.rs:68:1
    |
68  | pub struct Error {
    | ^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.
Couldn't compile the test.
---- src/types.rs - types::LakeConfig::s3_config (line 32) stdout ----
error[E0432]: unresolved import `http`
 --> src/types.rs:34:5
  |
4 | use http::Uri;
  |     ^^^^ use of undeclared crate or module `http`

warning: use of deprecated struct `aws_sdk_s3::Endpoint`: Use `.endpoint_url(...)` directly instead
 --> src/types.rs:33:17
  |
3 | use aws_sdk_s3::Endpoint;
  |                 ^^^^^^^^
  |
  = note: `#[warn(deprecated)]` on by default

warning: use of deprecated struct `aws_sdk_s3::Endpoint`: Use `.endpoint_url(...)` directly instead
  --> src/types.rs:42:13
   |
12 |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
   |             ^^^^^^^^

error[E0277]: the trait bound `Result<Endpoint, InvalidEndpointError>: ResolveEndpoint<Params>` is not satisfied
   --> src/types.rs:42:13
    |
11  |         .endpoint_resolver(
    |          ----------------- required by a bound introduced by this call
12  |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `ResolveEndpoint<Params>` is not imple
mented for `Result<Endpoint, InvalidEndpointError>`
    |
    = help: the following other types implement trait `ResolveEndpoint<Params>`:
              <&'static str as ResolveEndpoint<T>>
              <DefaultResolver as ResolveEndpoint<Params>>
              <Endpoint as ResolveEndpoint<T>>
              <aws_endpoint::EndpointShim as ResolveEndpoint<T>>
              <aws_sdk_sso::endpoint::DefaultResolver as ResolveEndpoint<aws_sdk_sso::endpoint::Params>>
              <aws_sdk_sts::endpoint::DefaultResolver as ResolveEndpoint<aws_sdk_sts::endpoint::Params>>
note: required by a bound in `aws_sdk_s3::config::Builder::endpoint_resolver`
   --> /Users/morganmccauley/.cargo/registry/src/github.com-1ecc6299db9ec823/aws-sdk-s3-0.23.0/src/config.rs:241:33
    |
241 |         endpoint_resolver: impl aws_smithy_http::endpoint::ResolveEndpoint<crate::endpoint::Params>
    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `
aws_sdk_s3::config::Builder::endpoint_resolver`

error[E0308]: mismatched types
  --> src/types.rs:40:15
   |
9  |       let mut s3_conf = aws_sdk_s3::config::Builder::from(&aws_config);
   |                         ---------------------------------------------- expected due to this value
10 |       s3_conf = s3_conf
   |  _______________^
11 | |         .endpoint_resolver(
12 | |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
13 | |         .build();
   | |________________^ expected struct `aws_sdk_s3::config::Builder`, found struct `aws_sdk_s3::Config`

error[E0308]: mismatched types
  --> src/types.rs:46:20
   |
16 |         .s3_config(s3_conf)
   |          --------- ^^^^^^^ expected struct `aws_sdk_s3::Config`, found struct `aws_sdk_s3::config::Builder`
   |          |
   |          arguments to this function are incorrect
   |
note: associated function defined here
  --> /Users/morganmccauley/Developer/Repositories/near-lake-framework-rs/src/types.rs:54:16
   |
54 |     pub(crate) s3_config: Option<aws_sdk_s3::config::Config>,
   |                ^^^^^^^^^

error[E0752]: `main` function is not allowed to be `async`
 --> src/types.rs:37:1
  |
7 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to 5 previous errors; 2 warnings emitted

Some errors have detailed explanations: E0277, E0308, E0432, E0752.
For more information about an error, try `rustc --explain E0277`.
Couldn't compile the test.
---- src/types.rs - types::LakeConfigBuilder::s3_config (line 32) stdout ----
error[E0432]: unresolved import `http`
 --> src/types.rs:34:5
  |
4 | use http::Uri;
  |     ^^^^ use of undeclared crate or module `http`

warning: use of deprecated struct `aws_sdk_s3::Endpoint`: Use `.endpoint_url(...)` directly instead
 --> src/types.rs:33:17
  |
3 | use aws_sdk_s3::Endpoint;
  |                 ^^^^^^^^
  |
  = note: `#[warn(deprecated)]` on by default

warning: use of deprecated struct `aws_sdk_s3::Endpoint`: Use `.endpoint_url(...)` directly instead
  --> src/types.rs:42:13
   |
12 |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
   |             ^^^^^^^^

error[E0277]: the trait bound `Result<Endpoint, InvalidEndpointError>: ResolveEndpoint<Params>` is not satisfied
   --> src/types.rs:42:13
    |
11  |         .endpoint_resolver(
    |          ----------------- required by a bound introduced by this call
12  |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `ResolveEndpoint<Params>` is not imple
mented for `Result<Endpoint, InvalidEndpointError>`
    |
    = help: the following other types implement trait `ResolveEndpoint<Params>`:
              <&'static str as ResolveEndpoint<T>>
              <DefaultResolver as ResolveEndpoint<Params>>
              <Endpoint as ResolveEndpoint<T>>
              <aws_endpoint::EndpointShim as ResolveEndpoint<T>>
              <aws_sdk_sso::endpoint::DefaultResolver as ResolveEndpoint<aws_sdk_sso::endpoint::Params>>
              <aws_sdk_sts::endpoint::DefaultResolver as ResolveEndpoint<aws_sdk_sts::endpoint::Params>>
note: required by a bound in `aws_sdk_s3::config::Builder::endpoint_resolver`
   --> /Users/morganmccauley/.cargo/registry/src/github.com-1ecc6299db9ec823/aws-sdk-s3-0.23.0/src/config.rs:241:33
    |
241 |         endpoint_resolver: impl aws_smithy_http::endpoint::ResolveEndpoint<crate::endpoint::Params>
    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `
aws_sdk_s3::config::Builder::endpoint_resolver`

error[E0308]: mismatched types
  --> src/types.rs:40:15
   |
9  |       let mut s3_conf = aws_sdk_s3::config::Builder::from(&aws_config);
   |                         ---------------------------------------------- expected due to this value
10 |       s3_conf = s3_conf
   |  _______________^
11 | |         .endpoint_resolver(
12 | |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
13 | |         .build();
   | |________________^ expected struct `aws_sdk_s3::config::Builder`, found struct `aws_sdk_s3::Config`

error[E0308]: mismatched types
  --> src/types.rs:46:20
   |
16 |         .s3_config(s3_conf)
   |          --------- ^^^^^^^ expected struct `aws_sdk_s3::Config`, found struct `aws_sdk_s3::config::Builder`
   |          |
   |          arguments to this function are incorrect
   |
note: associated function defined here
  --> /Users/morganmccauley/Developer/Repositories/near-lake-framework-rs/src/types.rs:54:16
   |
54 |     pub(crate) s3_config: Option<aws_sdk_s3::config::Config>,
   |                ^^^^^^^^^

error[E0752]: `main` function is not allowed to be `async`
 --> src/types.rs:37:1
  |
7 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to 5 previous errors; 2 warnings emitted

Some errors have detailed explanations: E0277, E0308, E0432, E0752.
For more information about an error, try `rustc --explain E0277`.
Couldn't compile the test.
---- src/lib.rs - (line 150) stdout ----
error[E0432]: unresolved import `http`
 --> src/lib.rs:152:5
  |
4 | use http::Uri;
  |     ^^^^ use of undeclared crate or module `http`

warning: use of deprecated struct `aws_sdk_s3::Endpoint`: Use `.endpoint_url(...)` directly instead
 --> src/lib.rs:151:17
  |
3 | use aws_sdk_s3::Endpoint;
  |                 ^^^^^^^^
  |
  = note: `#[warn(deprecated)]` on by default

warning: use of deprecated struct `aws_sdk_s3::Endpoint`: Use `.endpoint_url(...)` directly instead
  --> src/lib.rs:160:13
   |
12 |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
   |             ^^^^^^^^

error[E0277]: the trait bound `Result<Endpoint, InvalidEndpointError>: ResolveEndpoint<Params>` is not satisfied
   --> src/lib.rs:160:13
    |
11  |     .endpoint_resolver(
    |      ----------------- required by a bound introduced by this call
12  |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `ResolveEndpoint<Params>` is not imple
mented for `Result<Endpoint, InvalidEndpointError>`
    |
    = help: the following other types implement trait `ResolveEndpoint<Params>`:
              <&'static str as ResolveEndpoint<T>>
              <DefaultResolver as ResolveEndpoint<Params>>
              <Endpoint as ResolveEndpoint<T>>
              <aws_endpoint::EndpointShim as ResolveEndpoint<T>>
              <aws_sdk_sso::endpoint::DefaultResolver as ResolveEndpoint<aws_sdk_sso::endpoint::Params>>
              <aws_sdk_sts::endpoint::DefaultResolver as ResolveEndpoint<aws_sdk_sts::endpoint::Params>>
note: required by a bound in `aws_sdk_s3::config::Builder::endpoint_resolver`
   --> /Users/morganmccauley/.cargo/registry/src/github.com-1ecc6299db9ec823/aws-sdk-s3-0.23.0/src/config.rs:241:33
    |
241 |         endpoint_resolver: impl aws_smithy_http::endpoint::ResolveEndpoint<crate::endpoint::Params>
    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `
aws_sdk_s3::config::Builder::endpoint_resolver`

error[E0308]: mismatched types
  --> src/lib.rs:158:11
   |
9  |   let mut s3_conf = aws_sdk_s3::config::Builder::from(&aws_config);
   |                     ---------------------------------------------- expected due to this value
10 |   s3_conf = s3_conf
   |  ___________^
11 | |     .endpoint_resolver(
12 | |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
13 | |     .build();
   | |____________^ expected struct `aws_sdk_s3::config::Builder`, found struct `aws_sdk_s3::Config`

error[E0308]: mismatched types
  --> src/lib.rs:164:16
   |
16 |     .s3_config(s3_conf)
   |      --------- ^^^^^^^ expected struct `aws_sdk_s3::Config`, found struct `aws_sdk_s3::config::Builder`
   |      |
   |      arguments to this function are incorrect
   |
note: associated function defined here
  --> /Users/morganmccauley/Developer/Repositories/near-lake-framework-rs/src/types.rs:54:16
   |
54 |     pub(crate) s3_config: Option<aws_sdk_s3::config::Config>,
   |                ^^^^^^^^^

error[E0752]: `main` function is not allowed to be `async`
 --> src/lib.rs:155:1
  |
7 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to 5 previous errors; 2 warnings emitted

Some errors have detailed explanations: E0277, E0308, E0432, E0752.
For more information about an error, try `rustc --explain E0277`.
Couldn't compile the test.
---- src/types.rs - types::LakeConfigBuilder::s3_config (line 32) stdout ----
error[E0432]: unresolved import `http`
 --> src/types.rs:34:5
  |
4 | use http::Uri;
  |     ^^^^ use of undeclared crate or module `http`

warning: use of deprecated struct `aws_sdk_s3::Endpoint`: Use `.endpoint_url(...)` directly instead
 --> src/types.rs:33:17
  |
3 | use aws_sdk_s3::Endpoint;
  |                 ^^^^^^^^
  |
  = note: `#[warn(deprecated)]` on by default

warning: use of deprecated struct `aws_sdk_s3::Endpoint`: Use `.endpoint_url(...)` directly instead
  --> src/types.rs:42:13
   |
12 |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
   |             ^^^^^^^^

error[E0277]: the trait bound `Result<Endpoint, InvalidEndpointError>: ResolveEndpoint<Params>` is not satisfied
   --> src/types.rs:42:13
    |
11  |         .endpoint_resolver(
    |          ----------------- required by a bound introduced by this call
12  |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `ResolveEndpoint<Params>` is not imple
mented for `Result<Endpoint, InvalidEndpointError>`
    |
    = help: the following other types implement trait `ResolveEndpoint<Params>`:
              <&'static str as ResolveEndpoint<T>>
              <DefaultResolver as ResolveEndpoint<Params>>
              <Endpoint as ResolveEndpoint<T>>
              <aws_endpoint::EndpointShim as ResolveEndpoint<T>>
              <aws_sdk_sso::endpoint::DefaultResolver as ResolveEndpoint<aws_sdk_sso::endpoint::Params>>
              <aws_sdk_sts::endpoint::DefaultResolver as ResolveEndpoint<aws_sdk_sts::endpoint::Params>>
note: required by a bound in `aws_sdk_s3::config::Builder::endpoint_resolver`
   --> /Users/morganmccauley/.cargo/registry/src/github.com-1ecc6299db9ec823/aws-sdk-s3-0.23.0/src/config.rs:241:33
    |
241 |         endpoint_resolver: impl aws_smithy_http::endpoint::ResolveEndpoint<crate::endpoint::Params>
    |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in 
aws_sdk_s3::config::Builder::endpoint_resolver`

error[E0308]: mismatched types
  --> src/types.rs:40:15
   |
9  |       let mut s3_conf = aws_sdk_s3::config::Builder::from(&aws_config);
   |                         ---------------------------------------------- expected due to this value
10 |       s3_conf = s3_conf
   |  _______________^
11 | |         .endpoint_resolver(
12 | |             Endpoint::immutable("http://0.0.0.0:9000".parse::<Uri>().unwrap()))
13 | |         .build();
   | |________________^ expected struct `aws_sdk_s3::config::Builder`, found struct `aws_sdk_s3::Config`

error[E0308]: mismatched types
  --> src/types.rs:46:20
   |
16 |         .s3_config(s3_conf)
   |          --------- ^^^^^^^ expected struct `aws_sdk_s3::Config`, found struct `aws_sdk_s3::config::Builder`
   |          |
   |          arguments to this function are incorrect
   |
note: associated function defined here
  --> /Users/morganmccauley/Developer/Repositories/near-lake-framework-rs/src/types.rs:54:16
   |
54 |     pub(crate) s3_config: Option<aws_sdk_s3::config::Config>,
   |                ^^^^^^^^^

error[E0752]: `main` function is not allowed to be `async`
 --> src/types.rs:37:1
  |
7 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to 5 previous errors; 2 warnings emitted

Some errors have detailed explanations: E0277, E0308, E0432, E0752.
For more information about an error, try `rustc --explain E0277`.
Couldn't compile the test.
---- src/types.rs - types::LakeConfigBuilder::testnet (line 79) stdout ----
error[E0752]: `main` function is not allowed to be `async`
 --> src/types.rs:82:1
  |
5 | async fn main() {
  | ^^^^^^^^^^^^^^^ `main` function is not allowed to be `async`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0752`.
Couldn't compile the test.

failures:
    src/lib.rs - (line 103)
    src/lib.rs - (line 115)
    src/lib.rs - (line 150)
    src/lib.rs - (line 7)
    src/lib.rs - (line 73)
    src/lib.rs - streamer (line 241)
    src/types.rs - types::LakeConfig (line 7)
    src/types.rs - types::LakeConfig::s3_config (line 32)
    src/types.rs - types::LakeConfigBuilder::betanet (line 97)
    src/types.rs - types::LakeConfigBuilder::mainnet (line 61)
    src/types.rs - types::LakeConfigBuilder::s3_config (line 32)
    src/types.rs - types::LakeConfigBuilder::s3_config (line 32)
    src/types.rs - types::LakeConfigBuilder::testnet (line 79)

test result: FAILED. 0 passed; 13 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.81s

error: doctest failed, to rerun pass `--doc`

[khorolets]

Now I see. Most of the errors are related to the code snippets in the docs.

Some of the code in our docs is not expected to work (e.g. code snippet with the example of how to set environmental variables with S3 credentials)

We need to iterate over the doc errors and either make it a workable code piece or mark it properly using Documentation Tests :: Attributes chapter.

[khorolets]

It's going to be resolved in 0.8.0, related PR is #66