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

[Barry A. Warsaw]

Change by Barry A. Warsaw <barry at python.org>:


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title: Add documentation for METH_FASTCALL -> Add documentation for METH_FASTCALL and _PyObject_FastCall*()

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