Add labels in graph_classes.dot

graph_classes.dot

@@ -25,6 +25,7 @@ digraph "search"
   Node10 -> Node8 [dir="back",color="darkorchid3",style="dashed"];
   Node10 [label="permutation",height=0.2,width=0.4,color="black", fillcolor="white", style="filled",URL="$classpermutation.html"];
 
-  Node11 -> Node9 [dir="both",color="darkorchid3",style="dashed"];
+  Node11 -> Node9 [dir="back",color="darkorchid3",headlabel="points",labeldistance=3,labelangle=50];
+  Node11 -> Node9 [color="darkorchid3",headlabel="discrepancy",labeldistance=4,labelangle=-60];
   Node11 [label="dem_discr",height=0.2,width=0.4,color="black", fillcolor="white", style="filled", shape="ellipse"];
 }