Fixed Typo

Added a missing closing single quote so that the code formatting is correct.

Before:

![screen shot 2014-05-29 at 11 15 01 am](https://cloud.githubusercontent.com/assets/480159/3121501/3bfba814-e75d-11e3-9485-e91b128df967.png)

After:

![screen shot 2014-05-29 at 11 18 17 am](https://cloud.githubusercontent.com/assets/480159/3121539/a7b3959e-e75d-11e3-9ba3-e31260bdcef9.png)