[issue28750] Replace string with bytes in doc of unicode-escape an raw-unicode-escape

[Xiang Zhang]

Xiang Zhang added the comment:

> But I think the word "Python" in "Python bytes object" is redundant. It was needed in "Python string object" to distinguish from "C string" and "Python Unicode object".

Make sense. This "Python" actually appears in many places in the docs. I only change the related parts of this issue.

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Added file: http://bugs.python.org/file45561/unicode-escape-doc_v3.patch

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