[3.12] gh-125296: Fix strange fragment identifier for `name or flags` in argparse docs (GH-125297) (#125300)

gh-125296: Fix strange fragment identifier for `name or flags` in argparse docs (GH-125297)
(cherry picked from commit c1913effeed4e4da4d5310a40ab518945001ffba)

Co-authored-by: Savannah Ostrowski <savannahostrowski@gmail.com>