docs: correct fib tunnel diagram reference
The included image was pulling in figure 2, change to the correct
figure 11.
Type: docs
@@ -10,7 +10,7 @@ beforehand, so the recursive switch can be avoided if the packet can follow the
already constructed data-plane graph for the tunnel's destination. This process
of joining to DP graphs together is termed *stacking*.
-.. figure:: /_images/fib20fig2.png
+.. figure:: /_images/fib20fig11.png
Figure 11: Tunnel control plane object diagram
