Fixed #10052 -- Added import line for other aggregates used in examples. Thanks…

Fixed #10052 -- Added import line for other aggregates used in examples. Thanks to Tyler Brownell <tyler@bluefoxstudio.ca> for the suggestion.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@9787 bcc190cf-cafb-0310-a4f2-bffc1f526a37

docs/topics/db/aggregation.txt

@@ -88,6 +88,7 @@ If you want to generate more than one aggregate, you just add another
 argument to the ``aggregate()`` clause. So, if we also wanted to know
 the maximum and minimum price of all books, we would issue the query::
 
+    >>> from django.db.models import Avg, Max, Min, Count
     >>> Book.objects.aggregate(Avg('price'), Max('price'), Min('price'))
     {'price__avg': 34.35, 'price__max': Decimal('81.20'), 'price__min': Decimal('12.99')}