[HOLD][#53420683] Updates the broadcast messaging page of the knowledge base.



![1](https://f.cloud.github.com/assets/2251119/1655771/35923bfe-5b68-11e3-99e9-4a4c2c655ef8.jpg)


![2](https://f.cloud.github.com/assets/2251119/1655772/359d5e9e-5b68-11e3-80bf-b5b486b6b8ba.jpg)


![3](https://f.cloud.github.com/assets/2251119/1655773/35a2ca3c-5b68-11e3-91fb-1328f6970fca.jpg)