Changes to introductory heading and sentence

Before:
![screen shot 2014-11-01 at 11 51 14 am](https://cloud.githubusercontent.com/assets/8854342/4872320/153f949a-61df-11e4-961e-62f3d61acadc.png)

After:
![screen shot 2014-11-01 at 11 51 34 am](https://cloud.githubusercontent.com/assets/8854342/4872322/1738159c-61df-11e4-87cd-390c73409b76.png)