[3.12] Docs: Fix typo in datetime.tzinfo docstring (GH-107257) (#109032)

Docs: Fix typo in datetime.tzinfo docstring (GH-107257)
(cherry picked from commit 60a9eea3f56c002356998f5532b3ad870a1ffa8e)

Co-authored-by: Mikhail Samylov <Samylov-Mikhail@yandex.com>
Co-authored-by: Paul Ganssle <1377457+pganssle@users.noreply.github.com>
Co-authored-by: Hugo van Kemenade <hugovk@users.noreply.github.com>