[3.13] gh-142044: Add note to prefer `asyncio.timeout[_at]` over `asyncio.Timeout` (GH-144449) (#144566)

gh-142044: Add note to prefer `asyncio.timeout[_at]` over `asyncio.Timeout` (GH-144449)
(cherry picked from commit 0e7c06a85880ba790fac4239b0ff1052399a36ae)

Co-authored-by: kovan <xaum.io@gmail.com>