[3.14] gh-123299: Fix typos & grammar and copyedit What's New in 3.14 (GH-138040)#138041

hugovk merged 1 commit intopython:3.14python/cpython:3.14from

miss-islington:backport-5a7f5ea-3.14miss-islington/cpython:backport-5a7f5ea-3.14Copy head branch name to clipboard