a Removed symbol from soroban-sdk imports (#380)

docs/getting-started/hello-world.mdx

@@ -152,7 +152,7 @@ Once you've created a project, writing a contract involves writing Rust code in
 All contracts should begin with `#![no_std]` to ensure that the Rust standard library is not included in the build. The Rust standard library is large and not well suited to being deployed into small programs like those deployed to blockchains.
 
 ```rust
-use soroban_sdk::{contractimpl, symbol, vec, Env, Symbol, Vec};
+use soroban_sdk::{contractimpl, vec, Env, Symbol, Vec};
 ```
 
 The contract will need to import the types and macros that it needs from the `soroban-sdk` crate. Take a look at [Create a Project](#create-new-project) to see how to setup a project.
@@ -178,7 +178,7 @@ Putting those pieces together a simple contract will look like this.
 
 ```rust title="src/lib.rs"
 #![no_std]
-use soroban_sdk::{contractimpl, symbol, vec, Env, Symbol, Vec};
+use soroban_sdk::{contractimpl, vec, Env, Symbol, Vec};
 
 pub struct Contract;
 
@@ -201,7 +201,7 @@ Given a simple contract like the contract demonstrated in the Write a Contract s
 
 ```rust
 #![no_std]
-use soroban_sdk::{contractimpl, symbol, vec, Env, Symbol, Vec};
+use soroban_sdk::{contractimpl, vec, Env, Symbol, Vec};
 
 pub struct Contract;
 
@@ -223,7 +223,7 @@ mod test;
 #![cfg(test)]
 
 use super::{Contract, ContractClient};
-use soroban_sdk::{symbol, vec, Env};
+use soroban_sdk::{vec, Env};
 
 #[test]
 fn test() {