fix warning

Author: boomanaiden154

llvm/utils/git/code-format-helper.py

@@ -92,10 +92,11 @@ def pr_comment_text_for_diff(self, diff: str) -> str:
 {self.instructions}
 ``````````
 
-> [!WARNING]  
-> The reproduction instructions above might return results for more than one PR
-> a stack if you are using a stacked PR workflow. You can limit the results by
-> changing `origin/main` to the base branch/commit you want to compare against.
+:warning:
+The reproduction instructions above might return results for more than one PR
+a stack if you are using a stacked PR workflow. You can limit the results by
+changing `origin/main` to the base branch/commit you want to compare against.
+:warning:
 
 </details>