[docs] [issue8387] use universal newline mode in csv module examples

[R. David Murray]

R. David Murray added the comment:

The magic of newline='' in python3 is that it *preserves* the line end characters, which is the same thing binary mode does on windows.  The place that matters, as I remember it, is when there is a newline embedded inside a quoted string.  I don't remember *why* that matters, though :(.  But it had something to do with how the csv module processes the data internally.

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<http://bugs.python.org/issue8387>
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