[docs] [issue12855] linebreak sequences should be better documented

[Martin Panter]

Martin Panter added the comment:

Note to self, or anyone else handling this patch: See <https://bugs.python.org/issue22232#msg225769> for further improvement ideas:

* Might be good to bring back the reference to universal newlines, but say it accepts additional line boundaries
* Terry also suggested a doc string improvement

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<http://bugs.python.org/issue12855>
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