[3.12] Move What's New In Python 3.12 entries to the right section (GH-112447) (#112450)

Move What's New In Python 3.12 entries to the right section (GH-112447)

Jython and ctypes removals are unrelated to C API Removals.
(cherry picked from commit d44ee42cd7c9a40e1d7096b95476fe47156f571f)

Co-authored-by: Victor Stinner <vstinner@python.org>