[issue26778] More typo fixes

[Martin Panter]

Martin Panter added the comment:

Should exception messages be corrected in old versions, or just 3.6?

Apart from the few changes with comments, the rest look good to me.

I found some more cases (my patch is independent of Serhiy’s).

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Added file: http://bugs.python.org/file42488/an-consonant.patch

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