updated comments

docs/release_notes.rst

@@ -91,7 +91,7 @@ selected items using an export admin action.  However this meant that the export
 possible to select the export resource.  This has been fixed in v4 so that export workflow is now present when
 exporting via the Admin UI action.  For more information see :ref:`export documentation<export_via_admin_action>`.
 
-Export Selected fields
+Export selected fields
 ----------------------
 
 The :ref:`export 'confirm' page<export_confirm>` now includes selectable fields for export.

import_export/admin.py

@@ -581,8 +581,8 @@ class ExportMixin(BaseExportMixin, ImportExportMixinBase):
     """
     Export mixin.
 
-    This is intended to be mixed with django.contrib.admin.ModelAdmin
-    https://docs.djangoproject.com/en/dev/ref/contrib/admin/
+    This is intended to be mixed with
+    `ModelAdmin <https://docs.djangoproject.com/en/stable/ref/contrib/admin/>`_.
     """
 
     #: template for change_list view
@@ -591,9 +591,9 @@ class ExportMixin(BaseExportMixin, ImportExportMixinBase):
     export_template_name = "admin/import_export/export.html"
     #: export data encoding
     to_encoding = None
-    #: form class to use for the initial export step
-    #: Use :class:`~import_export.forms.ExportForm` if you would
-    #: like to disable selectable fields feature
+    #: Form class to use for the initial export step.
+    #: Assign to :class:`~import_export.forms.ExportForm` if you would
+    #: like to disable selectable fields feature.
     export_form_class = SelectableFieldsExportForm
 
     def get_urls(self):