[1.4.x] Fixed #18996 - Clarified overriden model methods not called on bulk operations

**kwargs`` in your method definitions, you are guaranteed that your

code will automatically support those arguments when they are added.

.. admonition:: Overriding Delete

.. admonition:: Overridden model methods are not called on bulk operations

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

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

    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

    :meth:`updating<django.db.models.query.QuerySet.update>` objects in bulk,

    since none of :meth:`~Model.save()`,

    :data:`~django.db.models.signals.pre_save`, and

    :data:`~django.db.models.signals.post_save` are called.

Executing custom SQL

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