[BE] Remind people there are rsts to update in docs/source (#95914)

Pull Request resolved: https://github.com/pytorch/pytorch/pull/95914
Approved by: https://github.com/msaroufim

.circleci/scripts/python_doc_push_script.sh

@@ -109,6 +109,7 @@ if [ "$is_main_doc" = true ]; then
   elif [ $undocumented -gt 0 ]; then
     echo undocumented objects found:
     cat build/coverage/python.txt
+    echo "Make sure you've updated relevant .rsts in docs/source!"
     exit 1
   fi
 else