Add docs on trigger ci (#13513)

Co-authored-by: sglang-bot <sglangbot@gmail.com>

.github/workflows/slash-command-handler.yml

@@ -22,8 +22,6 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
-        # We checkout the current context to get the script,
-        # but the script will fetch permissions from main as requested.
 
       - name: Set up Python
         uses: actions/setup-python@v5
@@ -32,7 +30,7 @@ jobs:
 
       - name: Install dependencies
         run: |
-          pip install requests PyGithub
+          pip install PyGithub
 
       - name: Handle Slash Command
         env: