PyLong_GetInfo() (part of Limited API) is missing in sphinx docs

[skirpichev]

See here: https://docs.python.org/3.12/c-api/stable.html#contents-of-limited-api

Linked PRs

• gh-122613: Document PyLong_GetInfo() (part of Limited API) #122280
• [3.12] gh-122613: Document PyLong_GetInfo() (part of Limited API) (GH-122280) #122644
• [3.13] gh-122613: Document PyLong_GetInfo() (part of Limited API) (GH-122280) #122645