Fix code block indent in ordered list

## Before

![screen shot 2014-12-05 at 16 48 25](https://cloud.githubusercontent.com/assets/11348/5323519/e928e1c4-7c9e-11e4-9dec-29a00f47c1bc.png)

## After

![screen shot 2014-12-05 at 16 50 52](https://cloud.githubusercontent.com/assets/11348/5323523/ecb16582-7c9e-11e4-90c4-7d9b6de28db1.png)