[variant.visit] qualify std::forward for consistency

Author: CaseyCarter

source/utilities.tex

@@ -4845,8 +4845,10 @@
 
 \pnum
 \effects
-Let \tcode{is...} be \tcode{vars.index()...}. Returns \tcode{\placeholdernc{INVOKE}(forward<Visitor>(vis), get<is>(}\brk{}
-\tcode{forward<Variants>(vars))...);}\iref{func.require}.
+Let \tcode{is...} be \tcode{vars.index()...}. Returns:
+\begin{codeblock}
+@\placeholdernc{INVOKE}@(std::forward<Visitor>(vis), get<is>(std::forward<Variants>(vars))...) // see \ref{func.require}
+\end{codeblock}
 
 \pnum
 \remarks
@@ -19782,4 +19784,3 @@
 \end{itemdescr}
 
 \xref ISO C 7.22.1.3, 7.22.1.4
-