Allow Dialog for classes as well, with restriction. (modelica#2618)

* Allow Dialog for classes as well, with restriction.
Closes modelica#2617

With some cleanup of text.

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

chapters/annotations.tex

@@ -1144,7 +1144,7 @@ \section{Annotations for the Graphical User Interface}\label{annotations-for-the
 that shall be updated -- ideally without impacting users of the class.
 If that is not possible the current class can have also have an obsolete-annotation.
 
-A declaration may have the following annotations:
+A component declaration may have the following annotation:
 \begin{lstlisting}[language=modelica]
 annotation(unassignedMessage = "message");
 \end{lstlisting}
@@ -1173,6 +1173,7 @@ \section{Annotations for the Graphical User Interface}\label{annotations-for-the
 \end{lstlisting}
 \end{example}
 
+A component declaration or a short replaceable class definition may have the following annotation:
 \begin{lstlisting}[language=modelica]
 annotation(Dialog(enable = true, tab = "General",
                   group = "",
@@ -1181,6 +1182,8 @@ \section{Annotations for the Graphical User Interface}\label{annotations-for-the
                   groupImage="modelica://MyPackage/Resources/Images/switch.png",
                   connectorSizing = false));
 \end{lstlisting}
+For a short replaceable class definition only the fields \lstinline!tab!, \lstinline!group!, \lstinline!enable! and
+\lstinline!groupImage! are allowed.
 
 The annotations \lstinline!tab! and \lstinline!group! define the placement of
 the component or of variables in a dialog with optional tab and group