[docs] [issue20487] Odd words in unittest.mock document.

[A.M. Kuchling]

A.M. Kuchling added the comment:

Maybe this would be clearer if it used the keyword, i.e. "using the :attr:`~Mock.side_effect` attribute".

Also, there's a typo in the quoted text: "two equality method" should be method'S'.

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nosy: +akuchling

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<http://bugs.python.org/issue20487>
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