Merge branch 'docs/fix-invalid-json' into 'master'

docs: Fix invalid JSON in example payload

See merge request gitlab-org/gitlab!38438

doc/user/project/integrations/webhooks.md

@@ -727,7 +727,7 @@ X-Gitlab-Event: Note Hook
         "type": "ProjectLabel",
         "group_id": null
       }
-    ],
+    ]
   }
 }
 ```