[issue13828] Further improve casefold documentation

[Benjamin Peterson]

Benjamin Peterson <benjamin at python.org> added the comment:

It's a bit unfriendly to launch into discussion of "compatiblity caseless matching" when the new reader probably has no idea what "compatibility-equivalence" is.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13828>
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