[docs] [issue28587] list.index documentation missing start and stop arguments

[Roundup Robot]

Roundup Robot added the comment:

New changeset efac7ac53933 by Raymond Hettinger in branch '3.6':
Issue #28587: Improve list examples in the tutorial
https://hg.python.org/cpython/rev/efac7ac53933

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<http://bugs.python.org/issue28587>
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