A formset's howto should only be shown once

[Scotchester]

In this example, it seems redundant to show the howto text for the "Content area" formset ("Enter one or two blocks of content to be featured at the top of the page.") each time. Or, maybe we need another level of howto text. One for outside the repeating groups of fields, and one for inside each field group.

Thoughts, @kurtw?