Remove trailing blank

chapters/classes.tex

@@ -1700,7 +1700,7 @@ \subsubsection{StateSelect}\label{stateselect}
           differentiated.",
  prefer "Prefer it as state over those having the default value
       (also variables can be selected, which do not appear
-      differentiated). ",
+      differentiated).",
 always "Do use it as a state."
 );
 \end{lstlisting}