Add suggested 'The' at start of sentence

Co-authored-by: Hans Olsson <HansOlsson@users.noreply.github.com>

chapters/equations.tex

@@ -186,7 +186,7 @@ \subsection{If-Equations}\label{if-equations}
 In an equation section, the equations in the body are seen as equations that must be satisfied.
 The bodies that are not selected have no effect on that model evaluation.
 
-\lstinline!if!-equations in equation sections which do not have exclusively parameter expressions as switching conditions shall have the same number of equations in each branch (a missing else is counted as zero equations and the number of equations is defined after expanding the equations to scalar equations).
+The \lstinline!if!-equations in equation sections which do not have exclusively parameter expressions as switching conditions shall have the same number of equations in each branch (a missing else is counted as zero equations and the number of equations is defined after expanding the equations to scalar equations).
 
 \begin{nonnormative}
 If this condition is violated, the single assignment rule would not hold, because the number of equations may change during simulation