gh-95913: Copyedit, link & format Typing Features section in 3.11 What's New (GH-96097)

Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
(cherry picked from commit 558768ff22e47582ae95ad7c3f8955407934916e)

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>