[issue43345] Add __required_keys__ and __optional_keys__ to TypedDict documentation

[Paul Bryan]

Change by Paul Bryan <pbryan at anode.ca>:


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keywords: +patch
pull_requests: +23453
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/24668

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<https://bugs.python.org/issue43345>
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