message: docs: update release instructions for Github releases
diff: @@ -308,6 +308,13 @@ Once it's all done, an [ANNOUNCE] thread announcing the release to the dev@ mail
  (venv)$ python send_email.py announce
  ```
  +### Github Release
  +
  +Finally, so the Github UI reflects the latest release, you should create a release from the
  +tag corresponding with the new version. Go to https://github.com/apache/incubator-superset/tags,
  +click the 3-dot icon and select `Create Release`, paste the content of the ANNOUNCE thread in the
  +release notes, and publish the new release.
  +
  ## Post release
  #### Refresh documentation website
  