[3.12] gh-67230: Add versionadded notes for QUOTE_NOTNULL and QUOTE_STRINGS (GH-114816) (#114840)

As @GPHemsley pointed out, GH-29469 omitted `versionadded` notes for the 2 new items.
(cherry picked from commit 586057e9f80d57f16334c0eee8431931e4aa8cff)

Co-authored-by: Skip Montanaro <skip.montanaro@gmail.com>