[docs] [issue17351] Remove explicit "object" inheritance in Python 3 docs

[Raymond Hettinger]

Changes by Raymond Hettinger <raymond.hettinger at gmail.com>:


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title: Fixed python3 descriptor documentation example + removal of explicit "object" inheritance in docs -> Remove explicit "object" inheritance in Python 3 docs

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17351>
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