Apply suggestions from code review

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

chapters/equations.tex

@@ -823,9 +823,9 @@ \section{Initialization, initial equation, and initial algorithm}\label{initiali
 \begin{itemize}
 \item A missing initial value of a discrete-time variable which does not influence the simulation result, may be automatically set to the \lstinline!start! value or its default without informing the user.
 For example, variables assigned in a \lstinline!when!-clause which are not accessed outside of the \lstinline!when!-clause and where \lstinline!pre! is not explicitly used on these variables, do not have an effect on the simulation.
-\item A start-value that is not fixed may be seen as fixed with a message/warning.
+\item A \lstinline!start!-attribute that is not fixed may be treated as fixed with a diagnostics.
 \item A consistent start-value or initial equation may be removed with a message/warning.
-\item Changing the initialization in a way that does not satisfy the initial equations and fixed start-values should generate an error.
+\item Tools must not change the initialization in a way that does not satisfy the initial equations and fixed start-values.
 \end{itemize}
 \end{nonnormative}