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

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

This is related only to 2.7. All correct in 3.x.

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nosy: +serhiy.storchaka
versions:  -Python 3.5, Python 3.6, Python 3.7

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