[docs] [issue27646] doc: yield from expression can be any iterable

Change by Terry J. Reedy <tjreedy@udel.edu>: ---------- resolution: -> fixed stage: patch review -> resolved status: open -> closed versions: +Python 3.8, Python 3.9 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue27646> _______________________________________