Revert "Use \firstuse where 'transient analysis' is introduced"

We'll take care of this in modelica#3146 instead.
See: modelica#2754 (comment)

This reverts commit 5fba04e.

chapters/classes.tex

@@ -284,7 +284,7 @@ \subsubsection{Prefix Rules}\label{prefix-rules}
 
 \subsection{Component Variability Prefixes}\label{component-variability-prefixes-discrete-parameter-constant}
 
-The prefixes \lstinline!discrete!, \lstinline!parameter!, \lstinline!constant! of a component declaration are called \firstuse[variability!prefix]{variability prefixes} and are the basis for defining in which situation the variable values of a component are initialized (see \cref{events-and-synchronization} and \cref{initialization-initial-equation-and-initial-algorithm}) and when they are changed during \firstuse{transient analysis} (i.e., solution of initial value problem of the hybrid DAE).
+The prefixes \lstinline!discrete!, \lstinline!parameter!, \lstinline!constant! of a component declaration are called \firstuse[variability!prefix]{variability prefixes} and are the basis for defining in which situation the variable values of a component are initialized (see \cref{events-and-synchronization} and \cref{initialization-initial-equation-and-initial-algorithm}) and when they are changed during transient analysis (i.e., solution of initial value problem of the hybrid DAE).
 Further details on how the prefixes relate to component variability, as well as rules applying to components the different variabilities, are given in \cref{component-variability}.