[locale.ctype.virtuals] Fix a decade-old typo

Author: cpplearner

source/text.tex

@@ -1615,7 +1615,7 @@
 are those in the basic character set\iref{lex.charset}.
 
 For any named \tcode{ctype} category with
-a \tcode{ctype<charT>} facet \tcode{ctc} and
+a \tcode{ctype<char>} facet \tcode{ctc} and
 valid \tcode{ctype_base::mask} value \tcode{M},
 \tcode{(ctc.\brk{}is(M, c) || !is(M, do_widen(c)) )} is \tcode{true}.
 \begin{footnote}