Change emphasized text into non-normative

Fixes modelica#2554

chapters/classes.tex

@@ -1008,10 +1008,11 @@ \section{Balanced Models}\doublelabel{balanced-models}
 \item
   The number of equations defined locally (i.e. not in any model or
   block component), including binding equations, and equations generated
-  from connect-equations. \emph{This includes the proper count for
-  when-clauses (see \autoref{when-equations}), and algorithms (see \autoref{algorithm-sections}),
-  and is also used for the flat Hybrid DAE formulation
-  (see \autoref{modelica-dae-representation})}.
+  from connect-equations.
+  \begin{nonnormative}
+  This includes the proper count for when-clauses (see \autoref{when-equations}), and algorithms (see \autoref{algorithm-sections}), and is also used for
+  the flat Hybrid DAE formulation (see \autoref{modelica-dae-representation}).
+  \end{nonnormative}
 \item
   The number of input and flow-variables present in each (top-level) public connector component.
   \begin{nonnormative}