Avoid overlong lines by:

* Reordering items in list.
* Rephrasing txt.

chapters/packages.tex

@@ -307,7 +307,7 @@ \section{External resources}\label{external-resources}
 are stored in other formats a similar mapping should be defined, such that a resource with a given path should be unique for any package name that precedes it.  The first
 part of the path shall not be the name of a class in the package given by the authority.  As above for \filename{Modelica 3.2.1/package.mo} i.e.\ resources starting from
 \filename{Modelica 3.2.1}, and \filename{modelica://Modelica.Mechanics/C.jpg} is \filename{Modelica 3.2.1/Mechanics/C.jpg} -- regardless of whether \lstinline!Modelica.Mechanics!
-is stored in \filename{Modelica 3.2.1/package.mo}, \filename{Modelica 3.2.1/Mechanics/package.mo}, or \filename{Modelica 3.2.1/Mechanics.mo}.
+is stored in \filename{Modelica 3.2.1/package.mo}, \filename{Modelica 3.2.1/Mechanics.mo}, or \filename{Modelica 3.2.1/Mechanics/package.mo}.
 
 For a Modelica-package stored as a single file, \filename{A.mo}, the resource
 \filename{modelica://A/C.jpg} refers to a file \filename{C.jpg} stored in the same
@@ -323,7 +323,6 @@ \section{External resources}\label{external-resources}
 Consider a top-level package \lstinline!Modelica! and a class
 \lstinline!Mechanics! inside it, a reference such as
 \filename{modelica://Modelica.Mechanics/C.jpg} is legal, while
-\filename{modelica://Modelica/Mechanics/C.jpg} is illegal. The reference
-\filename{modelica://Modelica.Mechanics/C.jpg} must also refer to a different
-resource than \filename{modelica://Modelica/C.jpg}.
+\filename{modelica://Modelica/Mechanics/C.jpg} is illegal. The references
+\filename{modelica://Modelica.Mechanics/C.jpg} and \filename{modelica://Modelica/C.jpg} must also refer to different resources.
 \end{example}