bpo-45600: Enhanced / clarified the docs for os.environ and os.environb (GH-29204) (GH-29322)

Co-authored-by: Ɓukasz Langa <lukasz@langa.pl>
(cherry picked from commit b17cfd150f4dc2816975d304a71110a2d445eaf0)

Co-authored-by: andrei kulakov <andrei.avk@gmail.com>
1 file changed