[1.6.x] Fixed #22113 -- changed object_name to model_name in CBV docs.

Thanks to trac user nikunj.sg for the report.

Backport of b887408486 from master.

docs/ref/class-based-views/mixins-multiple-object.txt

@@ -148,7 +148,7 @@ MultipleObjectMixin
         the list of data that this view is manipulating. If
         ``object_list`` is a queryset of Django objects and
         :attr:`context_object_name` is not set,
-        the context name will be the ``object_name`` of the model that
+        the context name will be the ``model_name`` of the model that
         the queryset is composed from, with postfix ``'_list'``
         appended. For example, the model ``Article`` would have a
         context object named ``article_list``.
@@ -204,4 +204,4 @@ MultipleObjectTemplateResponseMixin
         Returns a list of candidate template names. Returns the following list:
 
         * the value of ``template_name`` on the view (if provided)
-        * ``<app_label>/<object_name><template_name_suffix>.html``
+        * ``<app_label>/<model_name><template_name_suffix>.html``

docs/ref/class-based-views/mixins-single-object.txt

@@ -65,7 +65,7 @@ SingleObjectMixin
 
         Return the context variable name that will be used to contain the
         data that this view is manipulating. If :attr:`context_object_name` is
-        not set, the context name will be constructed from the ``object_name``
+        not set, the context name will be constructed from the ``model_name``
         of the model that the queryset is composed from. For example, the model
         ``Article`` would have context object named ``'article'``.
 
@@ -122,4 +122,4 @@ SingleObjectTemplateResponseMixin
         * the value of ``template_name`` on the view (if provided)
         * the contents of the ``template_name_field`` field on the
           object instance that the view is operating upon (if available)
-        * ``<app_label>/<object_name><template_name_suffix>.html``
+        * ``<app_label>/<model_name><template_name_suffix>.html``