apb 7318d748c1 Mention the word "regexp" and the fact that this inteface is obsolete
in the NAME section.

Previously, "man -k regex" printed the following two lines
with no hint that you needed to do "man 3 regexp" to get to
the man page associated with the first of the two lines:

regcomp, regexec, regsub, regerror (3) - regular expression handlers
regex, regcomp, regexec, regerror, regfree (3) - regular-expression library
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