[3.11] gh-105286: Further improvements to typing.py docstrings (GH-105363)

[JelleZijlstra]

(cherry picked from commit 9a89f1b)

• Issue: Improve typing.py docstrings #105286

[AlexWaygood]

I have no idea why the "Check if generated files are up to date" check is failing (I was hoping merging in main would fix it) ☹️

I won't be able to merge past it, since it's a "required" CI check.

[JelleZijlstra]

Weirdly the check doesn't fail on other 3.11 PRs. I guess I'll try merging 3.11 in again.

[AlexWaygood]

Weirdly the check doesn't fail on other 3.11 PRs

It seems to be failing on all PRs that touch .py files, but not on PRs that only touch .rst files. Presumably because different CI checks run on PRs that are deemed to be docs-only PRs

[AlexWaygood]

Same failures on:

• [3.11] typing: Improve documentation of generic classes and aliases (#105369) #105454
• [3.11] gh-103171: Revert undocumented behaviour change for runtime-checkable protocols decorated with @final #105445
• [3.11] gh-105375: Improve error handling in sqlite3 collation callback (GH-105412) #105441
• [3.11] gh-104692: Include commoninstall as a prerequisite for bininstall (GH-104693) #105429

[JelleZijlstra]

Opening an issue in a moment