[docs] [issue24475] The docs never define what a pool "task" is

[Ned Deily]

Changes by Ned Deily <nad at acm.org>:


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nosy: +davin, sbt
versions:  -Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue24475>
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