[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:

The only demure I got on this was from Ezio, who objected that the concept of 'scope' hadn't been introduced yet in the tutorial.  So I reworded it to avoid the word 'scope'.

Thanks, Rose.

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resolution:  -> fixed
stage: commit review -> resolved
status: open -> closed

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<http://bugs.python.org/issue21739>
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