[Docs-bugs] [issue45680] Documentation on `GenericAlias` objects and `__class_getitem__` could be improved

Change by Ken Jin <kenjin4096@gmail.com>: ---------- pull_requests: +28887 pull_request: https://github.com/python/cpython/pull/30689 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue45680> _______________________________________