[3.13] Clarify the docs for `args` in asyncio callbacks (GH-143873) (#144664)

Clarify the docs for `args` in asyncio callbacks (GH-143873)
(cherry picked from commit 40a82abe9335e78e34ca564243499490e50b8888)

Co-authored-by: Aarni Koskela <akx@iki.fi>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>