      many-to-many field.
  
  ``instance``
      The instance whose many-to-many relation is updated. This can be an
      instance of the ``sender``, or of the class the :class:`ManyToManyField`
      is related to.
  
  ``action``
      A string indicating the type of update that is done on the relation.
      This can be one of the following:
  
 
</s> remove     The intermediate model class describing the :class:`ManyToManyField`.
    This class is automatically created when a many-to-many field is
    defined; you can access it using the ``through`` attribute on the
    many-to-many field.
 </s> add     The intermediate model class describing the
    :class:`~django.db.models.ManyToManyField`. This class is automatically
    created when a many-to-many field is defined; you can access it using the
    ``through`` attribute on the many-to-many field. </s> remove :exc:`~django.core.excpetions.MultipleObjectsReturned` exception is an
 </s> add :exc:`~django.core.exceptions.MultipleObjectsReturned` exception is an </s> remove         :class:`~django.contrib.contettypes.generic.GenericForeignKey`, it's
 </s> add         :class:`~django.contrib.contenttypes.generic.GenericForeignKey`, it's </s> remove         :class:`~django.db.models.fields.BooleanField` on the model
 </s> add         :class:`~django.db.models.BooleanField` on the model </s> remove ``reverse``     ``False`` (``Pizza`` contains the :class:`ManyToManyField`,
                so this call modifies the forward relation)
 </s> add ``reverse``     ``False`` (``Pizza`` contains the
                :class:`~django.db.models.ManyToManyField`, so this call
                modifies the forward relation)
    instance of the ``sender``, or of the class the
    :class:`~django.db.models.ManyToManyField` is related to.
      many-to-many field.
  
  ``instance``
      The instance whose many-to-many relation is updated. This can be an
    instance of the ``sender``, or of the class the
    :class:`~django.db.models.ManyToManyField` is related to.
    instance of the ``sender``, or of the class the
    :class:`~django.db.models.ManyToManyField` is related to.
  
  ``action``
      A string indicating the type of update that is done on the relation.
      This can be one of the following:
  
keep keep keep keep replace replace keep keep keep keep keep
 Fixed broken links, round 3. refs #19516 
docs/ref/signals.txt