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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 737b53ec5d1a by Terry Jan Reedy in branch '2.7':
Issue #18676: Change 'positive' to 'non-negative' in queue.py put and get
http://hg.python.org/cpython/rev/737b53ec5d1a

New changeset 2122d56d6bc5 by Terry Jan Reedy in branch '3.3':
Issue #18676: Change 'positive' to 'non-negative' in queue.py put and get
http://hg.python.org/cpython/rev/2122d56d6bc5

New changeset d9a9fe5e700d by Terry Jan Reedy in branch 'default':
Issue #18676: Merge from 3.3
http://hg.python.org/cpython/rev/d9a9fe5e700d

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nosy: +python-dev

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