Promote section 'Nested Resource Controllers'

Hi. I would like to suggest that Nested Resource Controllers be promoted for visibility. In its current form, it is easy to miss, but it is an important segment for anyone who wants to develop a RESTful API.

Just speaking personally, I must have read past it a dozen times before I noticed it. And when asking for help on this topic, it was never referenced. The notes could be expanded to help users better grasp its intended use.

Thanks, Christopher