[docs] [issue16278] os.rename documentation slightly inaccurate

[Chris Jerdonek]

Chris Jerdonek added the comment:

> If it would help I could submit a single patch.

Yes, a single patch is best.  One way to make code more DRY is refactoring to use helper functions as needed (i.e. same code in multiple places -> one helper function).

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<http://bugs.python.org/issue16278>
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