Update chapters/annotations.tex

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

chapters/annotations.tex

@@ -111,7 +111,7 @@ \subsection{Annotations for Figures}\label{annotations-for-figures}
 A \lstinline!Figure! must be uniquely identified by its \lstinline!identifier! and a class having it in its collection.
 This means that a \lstinline!Figure! \lstinline!identifier! must be unique among all \lstinline!Figure! annotations within the same \lstinline!figures! annotation as well as among all \lstinline!figures! annotations from inherited classes.
 A \lstinline!Plot! \lstinline!identifier! on the other hand is only required to be unique among the \lstinline!plots! in the the same \lstinline!Figure! annotation.
-If the identifier is an empty string it cannot be used for programmatic access and is exempt from the uniqueness requirements.
+If an \lstinline!identifier! is an empty string it cannot be used for programmatic access and is exempt from the uniqueness requirements.
 
 \begin{nonnormative}
 For \lstinline!Figure!, this makes it possible to reference the plot from a