[docs] [issue28089] asyncio: Document that TCP_NODELAY is now used by default

[Roundup Robot]

Roundup Robot added the comment:

New changeset 726308cfe3b5 by Victor Stinner in branch '3.6':
catch_warnings() calls showwarning() if overriden
https://hg.python.org/cpython/rev/726308cfe3b5

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nosy: +python-dev

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