[tab:meta.trans.cv] Revert changes of add_cv

Author: frederick-vs-ja

source/meta.tex

@@ -1732,12 +1732,8 @@
 \indexlibraryglobal{add_cv}%
 \tcode{template<class T>\br
  struct add_cv;}                    &
- The member typedef \tcode{type} denotes \tcode{const volatile T}.
-\begin{tailnote}
-\keyword{const} or \keyword{volatile} has no effect when \tcode{T} is a
-reference, function, or top-level const- or volatile-qualified type, respectively.
-\end{tailnote}
-\\
+ The member typedef \tcode{type} denotes
+ \tcode{add_const_t<add_volatile_t<T>>}.                               \\
 \end{libreqtab2a}
 
 \rSec3[meta.trans.ref]{Reference modifications}