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

[STINNER Victor]

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

Serhiy: how are you supposed to modify local variables of a frame when these variables are stored in "fast locals"? Even if it's a rare useful, I think that it's ok to expose PyFrame_FastToLocalsWithError(), and maybe also PyFrame_FastToLocals().

It is useful you want write a debugger in pure C, and don't want to bother with fast locals special case.

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