Add missing \lstinline and say "prefix" instead of "keyword"

chapters/classes.tex

@@ -666,9 +666,7 @@ \subsection{Short Class Definitions}\label{short-class-definitions}
 \end{lstlisting}
 \end{example}
 
-If a short class definition inherits from a partial class the new class
-definition will be partial, regardless of whether it is declared with
-the keyword partial or not.
+If a short class definition inherits from a partial class the new class definition will be partial, regardless of whether it is declared with the prefix \lstinline!partial! or not.
 
 \begin{example}
 \begin{lstlisting}[language=modelica]