Clarify that component references work in this form.

It is a clarification, since it already states that they are component-references and the quoted part includes it.

See modelica/ModelicaStandardLibrary#4494

chapters/annotations.tex

@@ -1099,6 +1099,7 @@ \subsubsection{Text}\label{text}
   When quoted identifiers (e.g., \lstinline!rec.'}'.'quoted ident'!) are involved, the form \%\{\emph{par}\} must be used.
   Here, \emph{par} is a general \lstinline[language=grammar]!component-reference!, and the macro can be directly followed by a letter.
   Thus \lstinline!%{w}x%{h}! gives the value of \lstinline!w! directly followed by \emph{x} and the value of \lstinline!h!, while \lstinline!%wxh! gives the value of the parameter \lstinline!wxh!.
+  Additionally, \lstinline!%{a.p}! should give the value of the parameter \lstinline!p! in the component \lstinline!a!.
   If the parameter does not exist it is an error.
 \end{itemize}