Fixed #14997 - A typo in "Overriding delete". thanks phunehehe for the report.

    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_save`

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

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

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

Executing custom SQL

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