[docs] Typo in unittest.mock

[Joshua Nahum]

Minor typo "isintance" should be "isinstance"

Found in sentence:

Mock objects that use a class or an instance as a `spec` or `spec_set` are able
to pass `isintance` tests:




Present in docs for 3.3 and 3.4

~ Josh

Josh Nahum
Website: nahum.us
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