[docs] [issue1446619] extended slice behavior inconsistent with docs

[Mark Lawrence]

Mark Lawrence added the comment:

The attached patch is simple enough, surely it's a simple decision as to whether or not to commit it?

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nosy: +BreamoreBoy
versions: +Python 3.4, Python 3.5 -Python 3.2, Python 3.3

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<http://bugs.python.org/issue1446619>
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