[docs] [issue39136] Typos in whatsnew file and docs

Change by Terry J. Reedy <tjreedy@udel.edu>: ---------- pull_requests: +17177 pull_request: https://github.com/python/cpython/pull/17732 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue39136> _______________________________________