[1.8.x] Clarified that Model.delete() isn't called as a result of a cascading delete.

    Note that the :meth:`~Model.delete()` method for an object is not

    necessarily called when :ref:`deleting objects in bulk using a

    QuerySet<topics-db-queries-delete>`. To ensure customized delete logic

    gets executed, you can use :data:`~django.db.models.signals.pre_delete`

    and/or :data:`~django.db.models.signals.post_delete` signals.

    QuerySet <topics-db-queries-delete>` or as a result of a :attr:`cascading

    delete <django.db.models.ForeignKey.on_delete>`. To ensure customized

    delete logic gets executed, you can use

    :data:`~django.db.models.signals.pre_delete` and/or

    :data:`~django.db.models.signals.post_delete` signals.

    Unfortunately, there isn't a workaround when

    :meth:`creating<django.db.models.query.QuerySet.bulk_create>` or