[3.14] gh-133904: Fix `math.factorial` documentation (GH-133907) (#133918)

gh-133904: Fix `math.factorial` documentation (GH-133907)
(cherry picked from commit 27ed64575d34f04029ba1d353810f3db4f4f045b)

Co-authored-by: mkaraev <maruf.karaev97@gmail.com>
Co-authored-by: sobolevn <mail@sobolevn.me>