[docs] [issue6916] Remove deprecated items from asynchat

[Mark Lawrence]

Mark Lawrence added the comment:

Is it worth the effort of committing changes like this when according to https://docs.python.org/3/library/asynchat.html#module-asynchat "This module exists for backwards compatibility only. For new code we recommend using asyncio."?  See also issue6911.

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nosy: +BreamoreBoy

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue6916>
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