[3.11] Fix misspelling in docs for http.HTTPMethod (GH-99376) (#99451)

Fix misspelling in docs for http.HTTPMethod (GH-99376)
(cherry picked from commit f0d12ca0e0e31b678448b6192ebaf9720228d4fa)

Co-authored-by: Matt Harasymczuk <github.com@haras.pl>
Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>