[docs] [issue15543] central documentation for 'universal newlines'

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Since universal newline mode is discouraged and getting deprecated in
> the built-in open() function

There may (or may not :-)) be a misunderstanding. Universal newlines are not discouraged; it's the legacy "U" flag which is deprecated.

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<http://bugs.python.org/issue15543>
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