chore: contributing doc command should be same as ci (#139)

Author: nooma-42

CONTRIBUTING.md

@@ -52,18 +52,18 @@ To contribute to this project, you'll need to have Rust installed on your machin
 
 3. **Format Your Code**
 
-   Ensure that your code is properly formatted. We use `rustfmt` for formatting.
+   Ensure that your code is properly formatted. We use `rustfmt` with nightly toolchain for formatting.
 
    ```sh
-   cargo fmt
+   cargo +nightly fmt --all
    ```
 
 4. **Run Clippy**
 
    Run Clippy to catch common mistakes and ensure code quality.
 
    ```sh
-   cargo clippy
+   cargo clippy --all-targets --tests -- -Dwarnings
    ```
 
 ## Running Tests