Merged revisions 81654 via svnmerge from

Merged revisions 81654 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r81654 | antoine.pitrou | 2010-06-02 19:10:49 +0200 (mer., 02 juin 2010) | 10 lines

  Merged revisions 81652 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r81652 | antoine.pitrou | 2010-06-02 19:08:47 +0200 (mer., 02 juin 2010) | 4 lines

    Issue #8873: add a documentation note about possible performance issues with the
    default of unbuffered IO in subprocess.Popen.
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