[docs] [issue19431] Document PyFrame_FastToLocals() and PyFrame_FastToLocalsWithError()

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

I closed the issue because we decided to not document the function, but I'm still interested to mark the API is private. Such change is more sensitive, so I added it my larger "New C API" project which works on finding a way to deprecate functions and provide maybe helpers for backward and forward compatibility:
https://pythoncapi.readthedocs.io/bad_api.html#for-internal-use-only

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