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

[STINNER Victor]

STINNER Victor added the comment:

> The change is that TCP_NODELAY option is set by default in 3.6. It was not the case in 3.5.

Ah, it's a change in _asyncio_, ok. I missed that from the issue title, so I changed the title.

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