Explain 'preferred' plot in a more open way

Addressing comment by @maltelenz.

chapters/annotations.tex

@@ -145,9 +145,8 @@ \subsection{Annotations for Figures}\doublelabel{annotations-for-figures}
 \lstinline!group! is both the key used for grouping, and the name of the group
 for display purposes.
 
-If the \lstinline!preferred! attribute of \lstinline!Figure! is \lstinline!true!
-tools should should show the figure automatically when the class is simulated. A
-class may define multiple \lstinline!preferred! figures.
+The \lstinline!preferred! attribute of \lstinline!Figure! indicates whether the figure should be given preference when automatically determining which figures to show,
+and a class may define any number of \lstinline!preferred! figures.  For example, a tool might choose to automatically show all preferred figures when the class is simulated.
 
 The \lstinline!caption! attribute of \lstinline!Figure! can use the restricted
 form of text markup described in \autoref{text-markup-in-captions} as well as