Fixed #23283 -- Added default=False to BooleanField's in the docs.

Thanks Baptiste for the suggestion.

docs/releases/1.7.txt

@@ -185,7 +185,7 @@ class method can now directly :ref:`create Manager with QuerySet methods
 
     class Food(models.Model):
         kind = models.CharField(max_length=50)
-        vegetarian = models.BooleanField()
+        vegetarian = models.BooleanField(default=False)
         objects = FoodQuerySet.as_manager()
 
     Food.objects.pizzas().vegetarian()