[docs] [issue10665] Expand unicodedata module documentation

[Ezio Melotti]

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

I think Georg said that non-ascii chars shouldn't be used directly in the rst files, and one of the reasons is that they break `make pdf` (I haven't tried though).
I added him to the nosy.

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nosy: +georg.brandl

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