[docs] [issue24109] Documentation for difflib uses optparse

[R. David Murray]

R. David Murray added the comment:

Since the Tools script was only changed in 3.5 (I was looking at the wrong branch), I think the docs should only be changed for 3.5.

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stage:  -> commit review
versions:  -Python 2.7, Python 3.2, Python 3.3, Python 3.4, Python 3.5

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<http://bugs.python.org/issue24109>
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