[docs] [issue14502] Document better what happens on releasing an unacquired lock

[Sandro Tosi]

Changes by Sandro Tosi <sandro.tosi at gmail.com>:


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resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14502>
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