[docs] [issue6916] Remove deprecated items from asynchat

[Roundup Robot]

Roundup Robot added the comment:

New changeset aeeb385e61e4 by Giampaolo Rodola' in branch 'default':
#6916: attempt to fix BB failure
http://hg.python.org/cpython/rev/aeeb385e61e4

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<http://bugs.python.org/issue6916>
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