Small misc text changes and important change to controller doc 

Can anybody check my change to the "### Setting Content Type" section?

Also, I could not replicate said code in a test project. I don't know if things changed recently.
@edmz, sorry for the short delay. The day job called. :)

For now, let's just go with changing 'symbol' to 'atom', and we can use the rest of your change here. I'm planning on beginning to go over the whole Controller Guide tonight, continuing the sweep I've been doing of all the guides.