Fixed #9567 - Removed an extraneous 'are'.

A Form object encapsulates a sequence of form fields and a collection of

validation rules that must be fulfilled in order for the form to be accepted.

Form classes are created as subclasses of ``django.forms.Form`` and are

Form classes are created as subclasses of ``django.forms.Form`` and 

make use of a declarative style that you'll be familiar with if you've used

Django's database models.