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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

PyFrameObject already is documented in Doc/c-api/veryhigh.rst.
PyFrame_GetLineNumber() already is documented in Doc/c-api/reflection.rst.

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

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue19431>
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