update readme

Author: cynthialong0-0

examples/workflows/pr-review/README.md

@@ -233,12 +233,13 @@ The review prompt utilize [code review extension](https://github.com/gemini-cli-
    - Adjust review depth and focus areas
 
 3. Edit `.github/workflows/gemini-review.yml` to use the customized prompt:
+
    ```yml
    - prompt: '/code-review pr-review'
-   + prompt: '/gemini-review'
+   + prompt: '/gemini-review pr-review'
    ```
 
-3. Commit the file to your repository:
+4. Commit the file to your repository:
    ```bash
    git add .gemini/commands/gemini-review.toml
    git commit -m "feat: customize PR review prompt"