[docs] [issue26869] unittest longMessage docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7eb4fe57492f by Guido van Rossum in branch '3.5':
Issue #26869: Document unittest.TestCase.longMessage. (Mariatta)
https://hg.python.org/cpython/rev/7eb4fe57492f

New changeset d7279d803d1d by Guido van Rossum in branch '3.6':
Issue #26869: Document unittest.TestCase.longMessage. (Mariatta) (3.5->3.6)
https://hg.python.org/cpython/rev/d7279d803d1d

New changeset c7c428350578 by Guido van Rossum in branch 'default':
Issue #26869: Document unittest.TestCase.longMessage. (Mariatta) (3.6->3.7)
https://hg.python.org/cpython/rev/c7c428350578

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