[docs] [issue18676] Queue: document that zero is accepted as timeout value

[Zhongyue Luo]

Changes by Zhongyue Luo <zhongyue.luo at gmail.com>:


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keywords: +patch
Added file: http://bugs.python.org/file31187/queue_timeout_docstring.patch

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<http://bugs.python.org/issue18676>
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