gh-92308: Add Pending Removal section to 3.11 What's New (GH-92309)

* gh-92308: Add Pending Removal section to 3.11 What's New

* Use compact list; drop attributions

* Add short text, and also missing PyUnicode_InternImmortal

* Fix formatting

* markup fix

* Update Doc/whatsnew/3.11.rst

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

* Apply suggestions from code review

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

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Ezio Melotti <ezio.melotti@gmail.com>
(cherry picked from commit 0924b95f6e678beaf4a059d679515956bac608fb)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>