Include end of sentence as part of bullet list

The end of the last sentence in the list was on a new line, which seems to render as not belonging to the list.

As seen on http://documentation.mailgun.com/user_manual.html#receiving-messages-via-http-through-a-forward-action
![image](https://cloud.githubusercontent.com/assets/497458/2568186/f7792934-b8de-11e3-96de-9524dda191d6.png)

I believe GitHub renders rst differently, so it appears fine on GitHub while it doesn't on the Mailgun docs.