Publicize: Change 'Edit' to 'Edit Details' and add line break in Meta Box

Right now it kind of looks like "Edit Settings", so this change makes it a little more obvious that it's two different options and it also places them in a new line under the social networks:

![screen shot 2014-09-08 at 9 04 11 am](https://cloud.githubusercontent.com/assets/3220162/4188399/2ed5e342-3772-11e4-9b32-ddf6117f0f8f.png)