[3.13] gh-130102: drop "require numeric arguments" from pow() docs (GH-137456) (#137537)

gh-130102: drop "require numeric arguments" from pow() docs (GH-137456)
(cherry picked from commit 37b5a0d671685645db8f1d5ecfa1260587f1fc28)

Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>
Co-authored-by: Senthil Kumaran <senthil@python.org>