Merged revisions 79178 via svnmerge from

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

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  r79178 | georg.brandl | 2010-03-21 10:28:16 +0100 (So, 21 Mär 2010) | 1 line

  Clarify that for shell=True, the shell PID will be the child PID.
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