remove description line from content ratings portion of detail page for CLASSIND (bug 945926)

Requested by CLASSIND/DEJUS through IARC.

### After
![screen shot 2013-12-03 at 2 03 32 pm](https://f.cloud.github.com/assets/674727/1668521/3a4af758-5c67-11e3-901b-7b725fc75ad3.png)

### Before

![screen shot 2013-12-03 at 2 03 45 pm](https://f.cloud.github.com/assets/674727/1668522/3cf41e12-5c67-11e3-85a2-5b82fab17b59.png)