The explanation of `ag_suspended` should be added to Types and members

[x42005e1f]

This issue is similar to #138966. In #11590 (Python 3.12), the ag_suspended attribute was added to async generator objects, and this was also reflected in python/typeshed#10288. However, it is missing from the "Types and members" section of the inspect module.

Linked PRs

• gh-142994, gh-142996: document missing async generator and coroutine field entries in inspect #142997
• [3.14] gh-142994, gh-142996: document missing async generator and coroutine field entries in inspect (GH-142997) #143258
• [3.13] gh-142994, gh-142996: document missing async generator and coroutine field entries in inspect (GH-142997) #143287