Clarify that a when-clause cannot activate multiple reinit for the sa…

…me variable

chapters/equations.tex

@@ -440,6 +440,7 @@ \subsection{reinit}\label{reinit}
 \lstinline!x! is a \lstinline!Real! variable (or an array of \lstinline!Real! variables) that must be selected as a state (resp., states), i.e.\ \lstinline!reinit! on \lstinline!x! implies \lstinline!stateSelect = StateSelect.always! on \lstinline!x!.
 \lstinline!expr! needs to be type-compatible with \lstinline!x!.
 For any given variable (possibly an array variable), \lstinline!reinit! can only be applied (either to an individual variable or to a part of an array variable) in one \lstinline!when!-equation (applying \lstinline!reinit! to a variable in several \lstinline!when!- or \lstinline!elsewhen!-clauses of the same \lstinline!when!-equation is allowed).
+Multiple \lstinline!reinit! for a variable inside the same \lstinline!when!- or \lstinline!elsewhen!-clause must appear in different \lstinline!if!-equation branches (in order that at most one \lstinline!reinit! for the variable is active at any event).
 In case of \lstinline!reinit! active during initialization (due to \lstinline!when initial()!), see \cref{initialization-initial-equation-and-initial-algorithm}.
 
 \lstinline!reinit! does not break the single assignment rule, because \lstinline!reinit(x, expr)! in equations evaluates \lstinline!expr! to a value,