add troubleshooter message

Author: lucie-docs

.github/workflows/grading.yml

@@ -26,4 +26,4 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: troubleshooting steps
-        run: echo "" #Help the user to troubleshoot the activity
+        run: echo "See the following doc for help with enabling code scanning with CodeQL on a GitHub repository: https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/setting-up-code-scanning-for-a-repository" #Help the user to troubleshoot the activity