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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> If GIL is not released then all Python code in other threads is 
> effectively blocked.

But that would be a stupid implementation of sleep(). It is not desirable to clutter the docs with such mentions: most calls to the OS in the stdlib release the GIL.

Only if the behaviour was unintuitive (i.e. if it *didn't* release the GIL) would it make sense to document it.

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