[docs] [issue12155] queue example doesn't stop worker threads

[Roundup Robot]

Roundup Robot added the comment:

New changeset b44ec269abda by Victor Stinner in branch 'default':
Issue #12155: Fix queue doc example to join threads
https://hg.python.org/cpython/rev/b44ec269abda

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12155>
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