[docs] [issue18620] multiprocessing page leaves out important part of Pool example

[Davin Potts]

Changes by Davin Potts <python at discontinuity.net>:


Added file: http://bugs.python.org/file38031/issue18620_py27.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18620>
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