[docs] [issue14957] Improve docs for str.splitlines

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset 24572015e24f by R David Murray in branch '3.2':
#14957: clarify splitlines docs.
http://hg.python.org/cpython/rev/24572015e24f

New changeset 2a43088318ed by R David Murray in branch 'default':
#14957: clarify splitlines docs.
http://hg.python.org/cpython/rev/2a43088318ed

New changeset 0df7594e4ebd by R David Murray in branch '2.7':
#14957: clarify splitlines docs.
http://hg.python.org/cpython/rev/0df7594e4ebd

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nosy: +python-dev

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