Change one case of "short class definition" -> "short-class-definition"

Addressing comment by Hans:
- #2916 (comment)

chapters/classes.tex

@@ -692,7 +692,7 @@ \subsection{Short Class Definitions}\label{short-class-definitions}
 
 If a short class definition does not specify any specialized class the new class definition will inherit the specialized class (this rule applies iteratively and also for redeclare).
 
-A \lstinline[language=grammar]!base-prefix! applied in the short class definition does not influence its type, but is applied to components declared of this type or types derived from it; see also \cref{restriction-on-combining-base-classes-and-other-elements}.
+A \lstinline[language=grammar]!base-prefix! applied in the \lstinline[language=grammar]!short-class-definition! does not influence its type, but is applied to components declared of this type or types derived from it; see also \cref{restriction-on-combining-base-classes-and-other-elements}.
 
 \begin{example}
 \begin{lstlisting}[language=modelica]