[docs] [issue30304] TestCase.assertMultiLineEqual only registered for Unicode strings in 2.7

[Serhiy Storchaka]

Changes by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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versions:  -Python 3.5, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30304>
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