[2.2.x] Refs #30953 -- Added 2.1.15 release note for 0107e3d.

Backport of 39e39d0 from master

Author: felixxm

docs/releases/2.1.15.txt

@@ -9,4 +9,8 @@ Django 2.1.15 fixes a data loss bug in 2.1.14.
 Bugfixes
 ========
 
-* ...
+* Fixed a data loss possibility in the
+  :meth:`~django.db.models.query.QuerySet.select_for_update()`. When using
+  ``'self'`` in the ``of`` argument with :ref:`multi-table inheritance
+  <multi-table-inheritance>`, a parent model was locked instead of the
+  queryset's model (:ticket:`30953`).