Fixed #21648 -- Deprecated is_admin_site option to auth.views.password_reset().

docs/internals/deprecation.txt

@@ -54,6 +54,9 @@ about each item can often be found in the release notes of two versions prior.
 * The ``remove_tags()`` and ``strip_entities()`` functions in
   ``django.utils.html`` will be removed.
 
+* The ``is_admin_site`` argument to
+  ``django.contrib.auth.views.password_reset()`` will be removed.
+
 .. _deprecation-removed-in-1.9:
 
 1.9