Left-over from Modelica 1.1; clarify built-in good option.

chapters/functions.tex

@@ -883,8 +883,7 @@ \subsection{Automatic Vectorization}\label{scalar-functions-applied-to-array-arg
 end Add;
 \end{lstlisting}
 \lstinline!Add(1, [1,2,3])! adds one to each of the elements of the second
-argument giving the result \lstinline![2,3,4]!. However, it is illegal to
-write \lstinline!1 + [1,2,3]!, because the rules for the built-in
+argument giving the result \lstinline![2,3,4]!. For built-in operators one can do this with \lstinline!1 .+ [1,2,3]! but not with \lstinline!1 + [1,2,3]!, because the rules for the built-in
 operators are more restrictive.
 \end{example}