Change 'to' -> 'of' to work with both 'inputs' and 'outputs'

Co-authored-by: Hans Olsson <HansOlsson@users.noreply.github.com>

chapters/functions.tex

@@ -1333,7 +1333,7 @@ \subsection{Using the Derivative Annotation}\label{using-the-derivative-annotati
 \end{lstlisting}
 \end{example}
 
-The inputs and outputs to the derivative function of {\lstinline!order!} 1 are constructed as
+The inputs and outputs of the derivative function of {\lstinline!order!} 1 are constructed as
 follows:
 \begin{itemize}
 \item