comments) should always go to the release branch, if the documentation
to be fixed exists and is relevant to the release-branch codebase.
Doc fixes are always considered "safe" -- even when a release branch
-is in feature freeze, it can still receive doc fixes.
+is in feature freeze, it can still receive doc fixes. However, this
+rule is limited to fixing real problems in the documentation; cleanups
+and stylistic changes are excluded.
When you know that the change will be difficult to merge to the
master (e.g., because the code on master has changed a lot), you can