[issue27895] Spelling fixes

[Raymond Hettinger]

New submission from Raymond Hettinger:

Thanks for the patch.  Some of these were a bit embarrassing.

Removed the Lib/test/decimaltestdata because this is from an external source (not our code) that is periodically refreshed.   I had to hand edit some of the changes to test_asyncio because the patch was breaking those tests for some reason.  I had some hesitancy about changing function or variable names in real code and had to spend time looking at each in detail but they all seem legitimate.

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<http://bugs.python.org/issue27895>
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