Merged revisions 76900 via svnmerge from

Merged revisions 76900 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r76900 | antoine.pitrou | 2009-12-19 22:08:31 +0100 (sam., 19 déc. 2009) | 13 lines

  Merged revisions 76896,76898 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r76896 | antoine.pitrou | 2009-12-19 22:01:10 +0100 (sam., 19 déc. 2009) | 3 lines

    Issue #7545: improve documentation of the `buffering` argument in io.open().
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    r76898 | antoine.pitrou | 2009-12-19 22:06:36 +0100 (sam., 19 déc. 2009) | 3 lines

    Remove superfetatory paragraph (left there by mistake).
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