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

[Roundup Robot]

Roundup Robot added the comment:

New changeset dfd1019f75f9 by Yury Selivanov in branch '3.6':
Issue #28089: Document TCP_NODELAY in asyncio
https://hg.python.org/cpython/rev/dfd1019f75f9

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<http://bugs.python.org/issue28089>
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