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

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> PyFrame_FastToLocals() and PyFrame_LocalsToFast() are not documented and have weird interface. I think the use of them should be discouraged.

I suggest to document them, but explain in the documentation that they must not be used :-)

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