New lines in browsable API in HTTP details

If minifaction to the HTML is applied for browsable API, the HTTP response information would loose new lines since HTML white-space would be stripped. Adding `<br>` forces to preserve the new-lines.

Example:
![example](http://content.screencast.com/users/miki725/folders/Jing/media/0df1621c-4282-42d6-926f-3370126ec490/00000025.png)