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

[Xiang Zhang]

Changes by Xiang Zhang <angwerzx at 126.com>:


Added file: http://bugs.python.org/file45559/unicode-escape-doc_v2.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28750>
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