bpo-44353: Document that typing.NewType is now a class (GH-27319) (GH-27321)

(cherry picked from commit 7aac3f623610cf3dffbf548a5be5bfd4fa6790a0)

Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
1 file changed