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

[Ned Deily]

Ned Deily added the comment:

Yury, look good to you?

----------
stage: patch review -> commit review
versions: +Python 3.7

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28089>
_______________________________________