Proposed Changes to DjangoItem documentation

I was very confused as to how you actually import DjangoItem.
I searched extensively on the internet looking for actual code so I could see how it worked.
I finally found http://blog.just2us.com/2012/07/setting-up-django-with-scrapy/. It is much easier to understand with full files instead of code fragments.
I also edited where it says "we can see that the model is already saved" as I don't see how it's already saved.