Merged revisions 88371 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r88371 | antoine.pitrou | 2011-02-07 16:58:11 +0100 (lun., 07 févr. 2011) | 3 lines

  Clarify that IMAP4() implicitly calls open(), and that logout() implicitly calls shutdown().
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