Merged revisions 75580 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r75580 | georg.brandl | 2009-10-21 09:15:59 +0200 (Mi, 21 Okt 2009) | 1 line

  #7170: fix explanation about non-weakrefable builtin types.
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