fix file structure in What's included


old ascii file structure in Bootstrap 2.3.2
![screen shot 2013-08-18 at 10 28 23 pm](https://f.cloud.github.com/assets/1016365/984231/301c914a-0890-11e3-80a1-2f6db4c697e3.png)

current ascii file structure in Bootstrap 3.0 RC2
![screen shot 2013-08-18 at 10 28 18 pm](https://f.cloud.github.com/assets/1016365/984233/32fc0fd0-0890-11e3-99c0-610c8b413b7c.png)