[docs] [issue16278] Improve os.rename documentation and tests

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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assignee: docs at python -> 
components: +Library (Lib), Tests
nosy: +loewis
title: os.rename documentation slightly inaccurate -> Improve os.rename documentation and tests

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue16278>
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