Update chapters/classes.tex

Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

chapters/classes.tex

@@ -646,7 +646,6 @@ \subsection{Short Class Definitions}\label{short-class-definitions}
 \begin{lstlisting}[language=modelica]
 class IDENT1 = type-specifier class-modification;
 \end{lstlisting}
-
 is identical, except that \lstinline!type-specifier! (the base-class) may be replaceable and for the lexical
 scope of modifiers, where the short class definition does not introduce
 an additional lexical scope for modifiers, to the longer form