[optional.ref.assign] Add missing "return"

Author: eisenwave

source/utilities.tex

@@ -4747,7 +4747,11 @@
 
 \pnum
 \effects
-Equivalent to: \tcode{\exposid{convert-ref-init-val}(std::forward<U>(u))}.
+Equivalent to:
+\begin{codeblock}
+\exposid{convert-ref-init-val}(std::forward<U>(u));
+return *\exposid{val};
+\end{codeblock}
 \end{itemdescr}
 
 \rSec3[optional.ref.swap]{Swap}