[docs] [issue15899] howto/unicode.rst doctest corrections

[Senthil Kumaran]

Senthil Kumaran added the comment:

Thanks!. Verified the patch, it is fine and can be applied directly on
3.2 and 3.3 branch. Tested it as well. On 2.7, some changes would be
required.

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nosy: +orsenthil

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