[docs] [issue23251] mention in time.sleep() docs that it does not block other Python threads

[R. David Murray]

R. David Murray added the comment:

I actually didn't know that reitveld was smart enough to highlight just the text changes in a reflowed paragraph.

Nevertheless, for ease of looking at diff in the repository using the hg command (which is not that smart), I prefer to commit doc changes without the reflow, then do the reflow in a separate commit.  I don't know if other developers do this or not.

I think the patch is fine.

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stage:  -> commit review
versions: +Python 2.7, Python 3.4

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<http://bugs.python.org/issue23251>
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