Improve `TypedDict` documentation #2864

Job	Run time
Build docs	14s
Run tests (3.12)	13s
Run tests (pypy3.11)	26s
Run tests (3.9)	22s
Run tests (3.11)	12s
Run tests (3.10)	12s
Run tests (pypy3.9)	27s
Run tests (3.9.12)	21s
Run tests (3.13)	19s
Run tests (3.10.4)	24s
Run tests (3.11.0)	19s
Run tests (3.14)	18s
Run tests (3.12.0)	22s
Run tests (3.13.0)	20s
Run tests (pypy3.10)	28s
Create an issue if daily tests failed	-1s
	4m 56s

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