1.6 Release Notes don't explicitly mention the new fields attribute on Create/UpdateViews

[AndrewIngram]

Django 1.6 introduces a new fields attribute on CreateView and UpdateView which is provided to the modelform_factory to limit which fields are in the generated form.

The release notes briefly mention that the attribute should be used (​https://docs.djangoproject.com/en/dev/releases/1.6/#updateview-and-createview-without-explicit-fields), but makes no mention of the fact that this is new functionality (which for some reason I assumed already existed).

We simply need to add something to the release notes that explicitly highlights this.

[Tim Graham]

Does the attached look sufficient?

[Marc Tamlyn]

LGTM

[Tim Graham <timograham@…>]

In ec89e1725a29076d37b36f85de983b8a7cf7c329:

Fixed #21100 -- Noted that Create/UpdateViews.fields is new in 1.6

Thanks AndrewIngram for the suggestion.

[Tim Graham <timograham@…>]

In 7a2adec4d047492ed77aa0e027d889d442b0f59c:

[1.6.x] Fixed #21100 -- Noted that Create/UpdateViews.fields is new in 1.6

Thanks AndrewIngram for the suggestion.

Backport of ec89e1725a from master