[issue46677] TypedDict docs are incomplete

[Charlie Zhao]

Change by Charlie Zhao <zhaoyu_hit at qq.com>:


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pull_requests: +29907
stage: backport needed -> patch review
pull_request: https://github.com/python/cpython/pull/31808

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46677>
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