[issue21786] Use assertEqual in test_pydoc

[Roundup Robot]

Roundup Robot added the comment:

New changeset b1c7f28f9c0a by Raymond Hettinger in branch 'default':
Issue 21786:  Clean-up test_pydoc taking taking advantage of diffing in unittest.
http://hg.python.org/cpython/rev/b1c7f28f9c0a

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nosy: +python-dev

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<http://bugs.python.org/issue21786>
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