undocumenting isideogram, isphonogram, and isspecial

[Yuri Pankov]

Hi,

I have review upfor removing the manpages for isideogram(3),
isphonogram(3), isspecial(3), and their isw* and isw*_l friends:

https://reviews.freebsd.org/D17859

All of these are legacy BSD extensions, not used in the tree, and what's
more important lacking the relevant ctype entries in our locale data
(isspecial still does, but that's going away shortly as well).  All
three, especially isspecial, don't have definitive description for the
character class they are checking for.

I want to make sure removing the documentation is a correct direction
here, with other options being marking them as deprecated/obsolete in
their respective man pages, but that would still provide no answer about
what exactly they do (or did), which was original motivator for this
change: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=156920.

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