Improve doc of "Choosing from a populated table"
Improve doc of "Choosing from a populated table"

models.Language.objects.all() does gets evaluated at runtime but that returns a QuerySet, django only hit the database when we start iterating in the queryset.
Previous documentation was a bit misleading.

I would find more intuitive to recommend to use `language = factory.Iterator(models.Language.objects.all)` but I havn't changed that here, let me know if you prefer that I change it that way
FactoryBoy/factory_boy