fix(docs): example of sqlx_macros_unstable in config.toml

[df51d]

RUSTFLAGS space separates the arguments, so we actually have to combine them with an equal sign

[abonander]

Did you actually test this change? It should be passed as a single argument string to the rustc command regardless.

[df51d]

Did you actually test this change? It should be passed as a single argument string to the rustc command regardless.

Yes, I tested it. When my config.toml looks like this

[build]
rustflags = ["--cfg sqlx_macros_unstable"]

I am getting this error:

$ cargo build

error: failed to run `rustc` to learn about target-specific information

Caused by:
  process didn't exit successfully: `rustc - --crate-name ___ --print=file-names '--cfg sqlx_macros_unstable' --crate-type bin --crate-type rlib --crate-type dylib --crate-type cdylib --crate-t
ype staticlib --crate-type proc-macro --print=sysroot --print=split-debuginfo --print=crate-name --print=cfg` (exit status: 1)
  --- stderr
  error: Unrecognized option: 'cfg sqlx_macros_unstable'

For me this only works when I replace with =.