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

[Éric Araujo]

Éric Araujo added the comment:

Note that removing the unnecessary '(object)' may make it worse for e.g. beginners going from 3.x to 2.x, and slightly complicate porting patches.  Raymond approves the removal, yet added '(object)' in a 3.3 doc file in 5eca56b68840

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nosy: +eric.araujo

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<http://bugs.python.org/issue17351>
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