[docs] [issue21739] Add hint about expression in list comprehensions (https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions)

[R. David Murray]

R. David Murray added the comment:

OK, I have no objection to leaving the 2.7 tutorial alone.  It seems to me that the 3.x tutorial should be fixed, though, because it currently says the unrolled loop is equivalent, but it isn't.  The fact that this applies to all other comprehensions in python3 I think adds weight to the idea of including the information in the tutorial somehow.

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versions: +Python 3.4, Python 3.5 -Python 2.7

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