Don't write that model and class are the same

Closes modelica#1345

chapters/classes.tex

@@ -824,8 +824,7 @@ \section{Specialized Classes}\doublelabel{specialized-classes}
 and type.\\ \hline
 \lstinline!type! & May only be predefined types, enumerations, array of
 type, or classes extending from type.\\ \hline
-\lstinline!model! & Identical to \lstinline!class!, the basic class concept, i.e., no
-restrictions and no enhancements.\\ \hline
+\lstinline!model! & The normal modeling class in Modelica.\\ \hline
 \lstinline!block! & Same as \lstinline!model! with the restriction that each connector
 component of a \lstinline!block! must have prefixes \lstinline!input! and/or \lstinline!output! for all
 connector variables. {[}\emph{The purpose is to model input/output