[3.11] gh-101100: Fix sphinx warnings in `Doc/library/locale.rst` (GH-114425) (#114478)

gh-101100: Fix sphinx warnings in `Doc/library/locale.rst` (GH-114425)

* gh-101100: Fix sphinx warnings in `Doc/library/locale.rst`

* Remove `/` from signatures
(cherry picked from commit 7d21cae964fc47afda400fc1fbbcf7984fcfe819)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>