Consistently quote in grammar (and remove one spurious ;).

Note that some code fragments are Modelica and some "grammar"; that may be a bit confusing.
Closes modelica#2988

chapters/annotations.tex

@@ -1119,7 +1119,7 @@ \section{Annotations for the Graphical User Interface}\label{annotations-for-the
 
 \begin{lstlisting}[language=grammar]
   preferred-view-annotation:
-     annotation "(" preferredView "=" ("info" | "diagram" | "text") ")"
+     annotation "(" preferredView "=" ("""info""" | """diagram""" | """text""") ")"
 \end{lstlisting}
 
 The \fmtannotationindex{preferredView} annotation defines the default view when selecting the class.

chapters/connectors.tex

@@ -10,7 +10,7 @@ \section{Connect-Equations and Connectors}\label{connect-equations-and-connector
 Connections between objects are introduced by \lstinline!connect!-equations in the equation part of a class.
 A \lstinline!connect!-equation\index{connect@\robustinline{connect}!equation} has the following syntax:
 \begin{lstlisting}[language=grammar]
-connect(component-reference, component-reference);
+connect "(" component-reference "," component-reference ")" ";"
 \end{lstlisting}
 
 \begin{nonnormative}

chapters/functions.tex

@@ -1459,7 +1459,7 @@ \subsection{Using the Derivative Annotation}\label{using-the-derivative-annotati
 
 \begin{itemize}
 \item
-  \lstinline[language=grammar]!zeroDerivative = $\mathit{inputVar}_{1}$ { , zeroDerivative = $\mathit{inputVar}_{2}$ }!
+  \lstinline[language=grammar]!"zeroDerivative" "=" $\mathit{inputVar}_{1}$ { "," "zeroDerivative" "=" $\mathit{inputVar}_{2}$ }!
 \end{itemize}
 
 The derivative function is only valid if $\mathit{inputVar}_{1}$ (and $\mathit{inputVar}_{2}$ etc.) are independent of the variables the function call is differentiated with respect to (i.e.\ that the derivative of $\mathit{inputVar}_{1}$ is zero).
@@ -1539,7 +1539,7 @@ \subsection{Using the Derivative Annotation}\label{using-the-derivative-annotati
 
 \begin{itemize}
 \item
-  \lstinline[language=grammar]!noDerivative = $\mathit{inputVar}_{1}$!
+  \lstinline[language=grammar]!"noDerivative" "=" $\mathit{inputVar}_{1}$!
 \end{itemize}
 
 The derivative of $\mathit{inputVar}_{1}$ is excluded from the argument list of the derivative-function.

chapters/statements.tex

@@ -336,7 +336,7 @@ \subsection{If-Statement}\label{if-statement}
 [ else
   { statement ";" }
 ]
-end if;
+end if
 \end{lstlisting}
 
 The \lstinline!expression! of an \lstinline!if!- or \lstinline!elseif!-clause must be scalar \lstinline!Boolean! expression.

chapters/unitexpressions.tex

@@ -69,7 +69,8 @@ \section{The Syntax of Unit Expressions}\label{the-syntax-of-unit-expressions}
    unit_symbol | unit_prefix unit_symbol
 
 unit_prefix:
-   Y | Z | E | P | T | G | M | k | h | da | d | c | m | u | n | p | f | a | z | y
+   "Y" | "Z" | "E" | "P" | "T" | "G" | "M" | "k" | "h" | "da" 
+   | "d" | "c | "m" | "u" | "n" | "p" | "f" | "a" | "z" | "y"
 \end{lstlisting}
 
 A \lstinline!unit_symbol! is a string of letters. A basic support of units in