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

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 068a614e9d97 by Sandro Tosi in branch 'default':
Issue #14502: it's RuntimeError on 3.3
http://hg.python.org/cpython/rev/068a614e9d97

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<http://bugs.python.org/issue14502>
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