[docs] [issue13828] Further improve casefold documentation

[Jim Jewett]

Jim Jewett <jimjjewett at gmail.com> added the comment:

Frankly, I do think that sample code is too long, but correctness matters ... perhaps a better solution would be to add either a method or a unicodedata function that does the work, then the extra note could just say

Note that most case-insensitive matches should also match compatibility equivalent characters; see unicodedata.compatibity_casefold

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<http://bugs.python.org/issue13828>
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