[docs] [issue21366] Document that return in finally overwrites prev value

[R. David Murray]

R. David Murray added the comment:

The precisionist in me isn't quite happy, but any wording I've come up with to make it more precise isn't as informative :)  (The 'real' situation is that the return value of the function is determined by the last return statement executed, which in turn is determined by the try/finally logic....but as far as I can see the suggested phrasing is equivalent to that in every respect that matters).

I also have an impulse to add "so don't do that" :)

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<http://bugs.python.org/issue21366>
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