Add --fail to exit with non-zero return code when curl fails to create a PR. (#3187)

Author: sayanarijit

content/actions/reference/authentication-in-a-workflow.md

@@ -71,7 +71,8 @@ You can use the `GITHUB_TOKEN` to make authenticated API calls. This example wor
           --data '{
             "title": "Automated issue for commit: ${{ github.sha }}",
             "body": "This issue was automatically created by the GitHub Action workflow **${{ github.workflow }}**. \n\n The commit hash was: _${{ github.sha }}_."
-            }'
+            }' \
+          --fail
   ```
   {% endraw %}