[docs] [issue34476] asyncio.sleep(0) not documented

[Hrvoje Nikšić]

Hrvoje Nikšić <hniksic at gmail.com> added the comment:

Agreed about the special case. Minor change suggestion:

    ``sleep()` always suspends the current task, allowing other tasks to run.

That is, replace "switches execution to another [task]" because there might not be other tasks or they might not be executable - the idea is to allow them to run. Also, replace "pause" with "suspend" (because when delay<=0 there is not really a discernible pause).

https://github.com/python/cpython/pull/9643

If you'd still prefer the previous wording, I'll amend the PR.

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