docs: add --locked flag to "installing-yazi-from-source" commands (#…

…502)

The `--locked` flag tells Cargo to use the exact dependencies specified
in the Cargo.lock file, without attempting to update them.

documentation/installing-yazi-from-source.md

@@ -37,10 +37,10 @@ to the project.
    # in the yazi repository:
 
    # Install `yazi`, the main application
-   cargo install --path yazi-fm
+   cargo install --path yazi-fm --locked
 
    # Install `ya`, the command line interface that's internally used by yazi.nvim
-   cargo install --path yazi-cli
+   cargo install --path yazi-cli --locked
    ```
 
 4. In case there are any issues, you can try these steps: