[1.6.x] Added 1.6.3 release note for refs #21566.

Backport of 865392c478 from master

docs/releases/1.6.3.txt

@@ -10,3 +10,7 @@ several bugs in 1.6.2:
 * Content retrieved from the GeoIP library is now properly decoded from its
   default ``iso-8859-1`` encoding
   (`#21996 <http://code.djangoproject.com/ticket/21996>`_).
+
+* Fixed ``AttributeError`` when using
+  :meth:`~django.db.models.query.QuerySet.bulk_create` with ``ForeignObject``
+  (`#21566 <http://code.djangoproject.com/ticket/21566>`_).

docs/releases/index.txt

@@ -22,6 +22,7 @@ Final releases
 .. toctree::
    :maxdepth: 1
 
+   1.6.3
    1.6.2
    1.6.1
    1.6