Apply suggestion almost as discussed

chapters/syntax.tex

@@ -48,7 +48,9 @@ \section{Lexical conventions}\label{lexical-conventions}
   Q-IDENT where they are treated as part of the STRING or Q-IDENT
   lexical unit.
 \item
-  String constant concatenation \lstinline!"a" "b"! becoming \lstinline!"ab"! (as in C) is replaced by the \lstinline!+! operator in Modelica.
+  Concatenation of string literals requires a binary expression.
+  For example, \lstinline!"a" + "b"! evaluates to \lstinline!"ab"!.
+  There is no support for the C/C++ style of concatenating adjacent string literal tokens (for example, \lstinline[language=C]!"a" "b"! becoming \lstinline[language=C]!"ab"!).
 \item
   Modelica uses the same comment syntax as C++ and Java (i.e., \lstinline!//! signals the start of a line comment and \lstinline!/* $\ldots$ */! is a multi-line comment); comments may contain any Unicode character.
   Modelica also has structured comments in the form of annotations and string comments.