[1.5.x] Fixed #19477 - Documented generic_inlineformset_factory

Thanks epicserve for the suggestion.

Backport of 214fb70 from master

django/contrib/contenttypes/generic.py

@@ -430,7 +430,7 @@ def generic_inlineformset_factory(model, form=ModelForm,
                                   max_num=None,
                                   formfield_callback=None):
     """
-    Returns an ``GenericInlineFormSet`` for the given kwargs.
+    Returns a ``GenericInlineFormSet`` for the given kwargs.
 
     You must provide ``ct_field`` and ``object_id`` if they different from the
     defaults ``content_type`` and ``object_id`` respectively.

docs/ref/contrib/contenttypes.txt

@@ -452,14 +452,18 @@ need to calculate them without using the aggregation API.
 Generic relations in forms and admin
 ------------------------------------
 
-The :mod:`django.contrib.contenttypes.generic` module provides
-``BaseGenericInlineFormSet``,
-:class:`~django.contrib.contenttypes.generic.GenericTabularInline`
-and :class:`~django.contrib.contenttypes.generic.GenericStackedInline`
-(the last two are subclasses of
-:class:`~django.contrib.contenttypes.generic.GenericInlineModelAdmin`).
-This enables the use of generic relations in forms and the admin. See the
-:doc:`model formset </topics/forms/modelforms>` and
+The :mod:`django.contrib.contenttypes.generic` module provides:
+
+* ``BaseGenericInlineFormSet``
+* :class:`~django.contrib.contenttypes.generic.GenericTabularInline`
+  and :class:`~django.contrib.contenttypes.generic.GenericStackedInline`
+  (subclasses of
+  :class:`~django.contrib.contenttypes.generic.GenericInlineModelAdmin`)
+* A formset factory, :func:`generic_inlineformset_factory`, for use with
+  :class:`GenericForeignKey`
+
+These classes and functions enable the use of generic relations in forms
+and the admin. See the :doc:`model formset </topics/forms/modelforms>` and
 :ref:`admin <using-generic-relations-as-an-inline>` documentation for more
 information.
 
@@ -486,3 +490,14 @@ information.
 
     Subclasses of :class:`GenericInlineModelAdmin` with stacked and tabular
     layouts, respectively.
+
+.. function:: generic_inlineformset_factory(model, form=ModelForm, formset=BaseGenericInlineFormSet, ct_field="content_type", fk_field="object_id", fields=None, exclude=None, extra=3, can_order=False, can_delete=True, max_num=None, formfield_callback=None)
+
+    Returns a ``GenericInlineFormSet`` using
+    :func:`~django.forms.models.modelformset_factory`.
+
+    You must provide ``ct_field`` and ``object_id`` if they different from the
+    defaults, ``content_type`` and ``object_id`` respectively. Other parameters
+    are similar to those documented in
+    :func:`~django.forms.models.modelformset_factory` and
+    :func:`~django.forms.models.inlineformset_factory`.