[docs] [issue16036] simplify int() signature docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset e4598364ea29 by Chris Jerdonek in branch '3.2':
Issue #14783: Improve int() docstring and also str(), range(), and slice().
http://hg.python.org/cpython/rev/e4598364ea29

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<http://bugs.python.org/issue16036>
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