[3.10] bpo-46747: Add missing key parameters in the bisect docs (GH-31323) (GH-31329)

Added *key* parameter to `bisect.bisect()` and `bisect.insort()` in bisect module docs.
(cherry picked from commit 96084f4256d2d523b0a4d7d900322b032326e3ed)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>