Merged revisions 78141-78142 via svnmerge from

Merged revisions 78141-78142 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

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  r78141 | r.david.murray | 2010-02-10 20:38:42 -0500 (Wed, 10 Feb 2010) | 6 lines

  Issue 5754:  tweak shelve doc wording to make it clearer that even when
  writeback=True values are written to the backing store when assigned to
  the shelf.  Add test to confirm that this happens.  Doc patch and added
  test by Robert Lehmann.  I also fixed the cross references to the sync
  and close methods.
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  r78142 | r.david.murray | 2010-02-10 20:56:42 -0500 (Wed, 10 Feb 2010) | 3 lines

  Improve issue 7835 fix per MAL to handle the case that the
  module dictionary has also been cleared.
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