Add a note to the `regions` attribute
Add a note to the `regions` attribute

Refs https://github.com/matthiask/feincms3/issues/5

matthiask/django-content-editor,matthiask/django-content-editor,matthiask/feincms2-content,matthiask/feincms2-content,matthiask/django-content-editor,matthiask/feincms2-content,matthiask/django-content-editor