[docs] [issue25832] Document weird behavior of `finally` when it has `break` in it

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25832>
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