[issue43959] Improve documentation of PyContextVar C-API

[Stefan Behnel]

Change by Stefan Behnel <stefan_ml at behnel.de>:


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keywords: +patch
pull_requests: +24362
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/25671

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43959>
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