bug#48248: tr docs: mention what to expect now vs. future

[Paul Eggert]

Thanks for the bug report. This stuff about "the future" has been there 
for years so it's time to remove any predictions. I installed the 
attached revamp of the tr documentation to try to address the problems 
you mentioned, plus some others I noticed while in the neighborhood.

0001-tr-improve-multibyte-etc.-doc.patch
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0002-tr-mention-multibyte-problem-in-man-page.patch
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