[utility] Make spelling of 'cv void' more consistent

Author: tkoeppe

source/utilities.tex

@@ -8564,7 +8564,7 @@
 \pnum
 The simple call wrapper shall
 define two nested types named \tcode{argument_type} and \tcode{result_type} as synonyms
-for \tcode{\cv{} T*} and \tcode{Ret}, respectively,
+for \cv{} \tcode{T*} and \tcode{Ret}, respectively,
 when \tcode{pm} is
 a pointer to member function with cv-qualifier \textit{cv} and taking no
 arguments, where \textit{Ret} is \tcode{pm}'s return type.
@@ -8573,7 +8573,7 @@
 The simple call wrapper shall
 define three nested types named \tcode{first_argument_type},
 \tcode{second_argument_type}, and \tcode{result_type} as synonyms
-for \tcode{\cv{} T*}, \tcode{T1}, and \tcode{Ret}, respectively,
+for \cv{} \tcode{T*}, \tcode{T1}, and \tcode{Ret}, respectively,
 when \tcode{pm} is
 a pointer to member function with cv-qualifier \textit{cv} and taking
 one argument of type \tcode{T1}, where \textit{Ret} is \tcode{pm}'s return type.