The fix in commit v3.5.0-rc1~84^2 (Xcode: Escape all backslashes in
strings, 2015-12-27) is a change in behavior that can break existing
projects that worked around the inconsistency with other generators.
Add a release note to call attention to this change in behavior.
Move all development release notes into a new version-specific document:
tail -q -n +3 Help/release/dev/* > Help/release/3.5.rst
git rm -- Help/release/dev/*
except the sample topic:
git checkout HEAD -- Help/release/dev/0-sample-topic.rst
Reference the new document from the release notes index document.
Add a title and intro sentence to the new document by hand.