<!-- What's this PR for?  (Just a link to an issue is fine.) -->


**Testing Plan:** <!-- How have you tested? -->


**GIFs or Screenshots:** <!-- If a UI change.  See:
  https://zulip.readthedocs.io/en/latest/tutorials/screenshot-and-gif-software.html
  -->


<!-- Also be sure to make clear, coherent commits:
  https://zulip.readthedocs.io/en/latest/contributing/version-control.html
  -->
