[ci skip] flesh out part of the release docs

Author: evbauer

docs/source/developing/release.rst

@@ -98,7 +98,11 @@ This script will also make zip archive, which can be used for local testing to m
 .. note::
     This zip folder is not what we release. The actual zip folder is generated by Github, so that should be tested as well once it has been made.
 
-The release script does not push any changes to Github. That must be done manually with a ``git push``.
+.. note::
+    Once the script has generated the new release branch, update the changelog headings from "Changes in main" to "Changes in r12345" etc,
+    and delete the note near the top of the changelog about changes in ``main`` relative to the most recent release.
+    
+The release script does not push any changes to Github. Once you are ready to push the release branch, this must be done manually with a ``git push``. (This is a separate step from pushing the tag in the next step.)
 
 
 Release steps