[charconv.syn] Remove unnecessary "cv-unqualified"

Author: eisenwave

source/text.tex

@@ -25,7 +25,7 @@
 When a function is specified
 with a type placeholder of \tcode{\placeholder{integer-type}},
 the implementation provides overloads
-for \tcode{char} and all cv-unqualified signed and unsigned integer types
+for \tcode{char} and all signed and unsigned integer types
 in lieu of \tcode{\placeholder{integer-type}}.
 When a function is specified
 with a type placeholder of \tcode{\placeholder{floating-point-type}},