replace angle brackets

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

chapters/packages.tex

@@ -394,7 +394,7 @@ \section{Multilingual Descriptions}\label{multilingual-descriptions}
 Multiple occurences of the same string can be listed here, separated by space.
 \end{nonnormative}
 
-The \lstinline!<context identifier>! following the keyword \lstinline!msgctxt! shall be the full name of the Modelica class (e.g., \lstinline!Modelica.Blocks.Math.Sin!) where the text appears.
+The $\mathit{messageContext}$ following the keyword \lstinline!msgctxt! shall be the full name of the Modelica class (e.g., \lstinline!"Modelica.Blocks.Math.Sin"!) where the text appears.
 Short class definitions do not appear here.
 Texts in such classes belong to the enclosing full class definition.