Issue 1317: smtplib.SMTP docs - Python tracker

The docstring for the smtplib.SMTP class includes descriptions of some
instance attributes that are not covered by the documentation:

  does_esmtp
  ehlo_resp
  esmtp_features
  helo_resp

If these are intended as part of the public interface, they should be
documented in the .tex/.rst documentation, otherwise their descriptions
should be in a comment instead of a docstring.  (helo_resp is mentioned
in Misc/HISTORY, if that actually means anything.)