Remove link from introduction to chapter 'Modelica Concrete Syntax'

In the introduction, it's better to just focus on notation.

chapters/introduction.tex

@@ -99,12 +99,10 @@ \section{Some Definitions}\label{some-definitions}
 % - quality of implementation
 % - simulator
 
-\section{Notation and Grammar}\label{notation-and-grammar}
+\section{Notation}\label{notation}
 
 In Modelica code listings, keywords are highlighted with color and may come in both normal weight and boldface, for example, \lstinline!connect! and \lstinline!equation!.
 There are also certain recognized names with special meaning defined by the specification, highlighted with another color, for example, \lstinline!semiLinear!.
 % No need to describe appearance of comments, right?
 
 The meta symbols of the extended BNF-grammar are defined in~\cref{lexical-conventions}.
-
-See \cref{modelica-concrete-syntax} for a full lexical specification and grammar.

chapters/revisions.tex

@@ -453,8 +453,8 @@ \subsection{Main changes in Modelica 3.4}\label{main-changes-in-modelica-3-4}
   Clarified structural analysis, \cref{scope-of-the-specification}. Ticket
   \href{https://github.com/modelica/ModelicaSpecification/issues/588}{\#588}.
 \item
-  Clarified meta-symbols, \cref{notation-and-grammar} and 2.3.1. Ticket
-  \href{https://github.com/modelica/ModelicaSpecification/issues/1616}{\#1616}.
+  Clarified meta-symbols, \cref{notation} and 2.3.1.
+  Ticket \href{https://github.com/modelica/ModelicaSpecification/issues/1616}{\#1616}.
 \item
   Typo, \cref{identifiers}. Ticket
   \href{https://github.com/modelica/ModelicaSpecification/issues/1702}{\#1702}.