Add suggested 'The' at start of sentence

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

chapters/operatorsandexpressions.tex

@@ -292,7 +292,7 @@ \subsection{If-Expressions}\label{if-expressions}
 is one example of \lstinline!if!-expression. First \lstinline!expression1!, which must be \lstinline!Boolean! expression, is evaluated.
 If \lstinline!expression1! is true \lstinline!expression2! is evaluated and is the value of the \lstinline!if!-expression, else \lstinline!expression3! is evaluated and is the value of the \lstinline!if!-expression.
 The two expressions, \lstinline!expression2! and \lstinline!expression3!, must be type compatible expressions (\cref{type-compatible-expressions}) giving the type of the \lstinline!if!-expression.
-\lstinline!if!-expressions with \lstinline!elseif!\index{elseif@\robustinline{elseif}!if-expression} are defined by replacing \lstinline!elseif! by \lstinline!else if!.
+The \lstinline!if!-expressions with \lstinline!elseif!\index{elseif@\robustinline{elseif}!if-expression} are defined by replacing \lstinline!elseif! by \lstinline!else if!.
 For short-circuit evaluation see \cref{evaluation-order}.
 
 \begin{nonnormative}