[issue7347] Add {Create|Delete}KeyEx to _winreg, doc and test updates

[Brian Curtin]

Brian Curtin <curtin at acm.org> added the comment:

Fixed a few a/an word changes and a few tab/space issues. Re-uploaded to Rietveld at http://codereview.appspot.com/580041

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Added file: http://bugs.python.org/file16558/issue7347.diff

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