remove last FunRefArity

book.tex

@@ -15761,12 +15761,12 @@ application, we turn function references into closures.
 \begin{minipage}{0.3\textwidth}
 {\if\edition\racketEd
 \begin{lstlisting}
-(FunRefArity |$f$| |$n$|)
+(FunRef |$f$| |$n$|)
 \end{lstlisting}
 \fi}
 {\if\edition\pythonEd
 \begin{lstlisting}
-FunRefArity(|$f$|, |$n$|)
+FunRef(|$f$|, |$n$|)
 \end{lstlisting}
 \fi}
 \end{minipage}