Fix typo in "What's new in Python 3.9" (GH-20559)


Automerge-Triggered-By: @pablogsal
(cherry picked from commit 491a3d3a75b656c8317d8ce343aea767978b946c)

Co-authored-by: Lysandros Nikolaou <lisandrosnik@gmail.com>
1 file changed