[issue28805] Add documentation for METH_FASTCALL and _PyObject_FastCall*()

[Jeroen Demeyer]

Change by Jeroen Demeyer <J.Demeyer at UGent.be>:


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keywords: +patch
pull_requests: +13938
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/14079

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28805>
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