[3.12] gh-106948: Update documentation nitpick_ignore for c:identifer domain (GH-107295) (#107297)

gh-106948: Update documentation nitpick_ignore for c:identifer domain (GH-107295)

Update the nitpick_ignore of the documentation configuration to fix
Sphinx warnings about standard C types when declaring functions with
the "c:function" markups.

Copy standard C types declared in the "c:type" domain to the
"c:identifier" domain, since "c:function" markup looks for types in
the "c:identifier" domain.

(cherry picked from commit b1de3807b832b72dfeb66dd5646159d08d2cc74a)

Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>