[3.12] gh-107619: Extend functools LRU cache docs with generators and async functions (GH-107934) (#108161)

gh-107619: Extend functools LRU cache docs with generators and async functions (GH-107934)
(cherry picked from commit 1a713eac47b26899044752f02cbfcb4d628dda2a)

Co-authored-by: Hadházy Tamás <85063808+Hels15@users.noreply.github.com>
Co-authored-by: Adam Turner <9087854+AA-Turner@users.noreply.github.com>
Co-authored-by: Kumar Aditya <kumaraditya@python.org>