Update chapters/equations.tex

Remove double space.

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

chapters/equations.tex

@@ -748,7 +748,7 @@ \section{Initialization, initial equation, and initial algorithm}\label{initiali
 (such as simulation or linearization).
 
 The equations of a when-clause are active during initialization, if and only if they are explicitly enabled with \lstinline!initial()!, and only in one of the two forms
-\lstinline!when initial() then! or \lstinline!when {$\ldots$, initial(), $\ldots$} then! (and similarly for \lstinline!elsewhen!  and algorithms see below).  In this case, the when-clause equations remain active during the
+\lstinline!when initial() then! or \lstinline!when {$\ldots$, initial(), $\ldots$} then! (and similarly for \lstinline!elsewhen! and algorithms see below).  In this case, the when-clause equations remain active during the
 whole initialization phase.  In case of a \lstinline!reinit(x, expr)! being active during initialization (due to being inside \lstinline!when initial()!) this is interpreted as adding
 \lstinline!x = expr! (the \lstinline!reinit!-equation) as an initial equation.