Add example for non link metadata in footer

With the change in 00c26ed we should show what non link metadata in the document footer looks like. This commit adds an example in the docs. Screenshots:

![screen shot 2014-12-19 at 11 15 26](https://cloud.githubusercontent.com/assets/449004/5503567/6544df84-8770-11e4-8d20-cfdd7b6bea71.png)
![screen shot 2014-12-19 at 11 15 19](https://cloud.githubusercontent.com/assets/449004/5503569/67ba7a80-8770-11e4-9b04-3ed0e2be82be.png)