[docs] [issue17140] Document multiprocessing.pool.ThreadPool

[Antoine Pitrou]

Changes by Antoine Pitrou <pitrou at free.fr>:


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assignee:  -> docs at python
components: +Documentation -Library (Lib)
nosy: +docs at python
versions: +Python 3.6, Python 3.7 -Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17140>
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