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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 150d36dbe3ba by Victor Stinner in branch '3.6':
warnings: Fix the issue number
https://hg.python.org/cpython/rev/150d36dbe3ba

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