[3.12] GH-109190: Copyedit 3.12 What's New: asyncio (GH-109661) (#109733)

GH-109190: Copyedit 3.12 What's New: asyncio (GH-109661)
(cherry picked from commit c32abf1f21c4bd32abcefe4d601611b152568961)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
Co-authored-by: Itamar Oren <itamarost@gmail.com>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>