docs: fix typo in repository clone instructions

Corrected the directory name in the cloning instructions from
'cd gin-host-route' to 'cd echo-host-route' to match the actual
repository name, ensuring users can follow the setup process
without confusion.

CONTRIBUTING.md

@@ -34,7 +34,7 @@ To implement a new feature, fix a bug, or improve documentation:
 
    ```sh
    git clone https://github.com/YidiDev/echo-host-route.git
-   cd gin-host-route
+   cd echo-host-route
    ```
 
 3. **Create a New Branch**