Fixed topology.conf example so it matches the image

Came across this when I tried to use it as sample data. The example topology file doesn't match the image it refers to.

For example, here's the original topology:

![Original Topo](http://i.imgur.com/DMzqyFO.png)

And after this pull request:

![New Topo](http://i.imgur.com/68ke388.png)