[docs] [issue16197] Several small errors in winreg documentation

[Zachary Ware]

Zachary Ware added the comment:

Not bad, but with that scheme we could even go as far as cutting out the 'WindowsError is OSError' bit and make it just 

"""
   ..versionchanged:: 3.3
     See :ref:`above <exception-changed>`.
"""

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<http://bugs.python.org/issue16197>
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