[docs] I found a bug in tutorial document

[DongWoo Son]

Hi.

in this document,
http://docs.python.org/py3k/tutorial/datastructures.html

>>> basket = {'apple', 'orange', 'apple', 'pear', 'orange', 'banana'}>>> print(basket){'orange', 'banana', 'pear', 'apple'}>>> fruit = ['apple', 'orange', 'apple', 'pear', 'orange', 'banana']>>> fruit = set(basket)               # create a set without duplicates

the last sentence should be like below one. basket was originally set,
so we don't need to change to set redundantly I think.

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>>> fruit = set(fruit)               # create a set without duplicates

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