add hyperlink to tip

Author: akohlmey

lammps-tutorials.tex

@@ -1668,9 +1668,10 @@ \subsubsection{Breakable bonds}
 
 \begin{note}
   Bonds cannot be displayed by the \lmpcmdnote{dump image} when using
-  the \lmpcmdnote{atom\_style atomic}, as it contains no bonds.
-  A tip for displaying bonds with the present system is provided at
-  the end of the tutorial.
+  the \lmpcmdnote{atom\_style atomic}, as it contains no bonds.  A tip
+  for displaying bonds with the present system using LAMMPS is provided
+  at the end of the tutorial.  You can also use external tools like VMD
+  or OVITO (see \hyperref[tip-dynamic-bonds]{tip for tutorial 3}).
 \end{note}
 
 \paragraph{Launch the deformation}
@@ -1719,6 +1720,7 @@ \subsubsection{Breakable bonds}
 \end{figure}
 
 \paragraph{Tip: bonds representation with AIREBO}
+\label{tip-dynamic-bonds}
 
 In the input file
 % do not wrap this line