[docs] [issue18705] Fix arround 100 typos/spelling mistakes

[Mark Dickinson]

Mark Dickinson added the comment:

Thanks for the patch.

I don't think there's a strict policy about using American spellings in the source;  I think spellings like 'behaviour' and 'grey' should be left alone.

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nosy: +mark.dickinson

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<http://bugs.python.org/issue18705>
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