Fix FAQ Footnotes

Missing `:`s, which didn't get converted over. This will ensure they render correctly.

## Before

![screen shot 2014-09-16 at 9 39 18 am](https://cloud.githubusercontent.com/assets/282759/4287856/f491d566-3da6-11e4-9349-7ef9b38c9f6b.png)

## After

![screen shot 2014-09-16 at 9 39 49 am](https://cloud.githubusercontent.com/assets/282759/4287858/f7a21de2-3da6-11e4-8af7-3c8d2cb9797f.png)