Insert heading between solution descriptions

At the end of the [Working with Nested Views](http://addyosmani.github.io/backbone-fundamentals/#working-with-nested-views) section it says

> Generally speaking, more developers opt for Solution 1 or 5

though there are only headings for solutions 1 through 4.

I believe the heading for Solution 5 goes here, but please correct me if I'm wrong.