bpo-28556: Remove another mention of metaclass of Generic in typing docs (GH-16743)


Metaclass was removed in Python 3.7 (there is already a `versionchanged` item about this).

https://bugs.python.org/issue28556
(cherry picked from commit 8144095707f87bdee6f3e1bbb15283ea61381be6)

Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>
1 file changed