[3.14] gh-136520: Clarify docs for _pack_ & _align_ (GH-137036)#137381

miss-islington wants to merge 1 commit intopython:3.14python/cpython:3.14from

miss-islington:backport-8943bb7-3.14miss-islington/cpython:backport-8943bb7-3.14Copy head branch name to clipboard