[3.10] gh-93738: Documentation C syntax (:c:type: to :c:expr:, misc. cases) (GH-97775) (#97891)

(cherry picked from commit 6b3d4db02edc5883a7e7cbe088711edaef0d9853)

Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>