Update chapters/statements.tex

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

chapters/statements.tex

@@ -177,7 +177,7 @@ \subsection{For-Statement}\label{for-statement}
 \end{lstlisting}
 The rules for \lstinline!for!-statements are the same as for \lstinline!for!-expressions in \cref{explicit-iteration-ranges-of-for-equations} -- except that the \lstinline!expression! of a \lstinline!for!-statement is not restricted to a parameter-expression.
 
-If the \lstinline!for!-statement contains expressions that will generate events the range should be an evaluable expression.
+If the \lstinline!for!-statement contains expressions that will generate events, the range shall be an evaluable expression.
 \begin{nonnormative}
 The same event-generating expression in different iterations of the for-loop are seen as different crossing functions, and the restriction ensures that their number is known during translation time.
 \end{nonnormative}