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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2e6fda267a20 by Martin Panter in branch '2.7':
Issue #12855: Document what exactly unicode.splitlines() splits on
https://hg.python.org/cpython/rev/2e6fda267a20

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12855>
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