Fixed the format of one letter-based list
minor #4016 Fixed the format of one letter-based list (javiereguiluz)

This PR was merged into the 2.4 branch.

Discussion
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Fixed the format of one letter-based list

This is how this list was displayed on the website:

![wrong_list_formatting](https://cloud.githubusercontent.com/assets/73419/3537741/b4e96d8c-0824-11e4-96e2-afec90916920.png)

Commits
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d87d803 Fixed the format of one letter-based list