Fix openstack-dev ML ref in test removal process.

Change-Id: I281ab52bc714e6b6dc1529f13b700d23caaf6f41
diff --git a/doc/source/test_removal.rst b/doc/source/test_removal.rst
index e249bdd..ff4fa09 100644
--- a/doc/source/test_removal.rst
+++ b/doc/source/test_removal.rst
@@ -128,8 +128,9 @@
 people to respond to removal proposals please add things to the agenda by the
 Monday before the meeting.
 
-The other option is to raise the removal on the openstack-dev mailing list.
-(for example see: http://lists.openstack.org/pipermail/openstack-dev/2016-February/086218.html )
+The other option is to raise the removal on the openstack-discuss mailing list.
+(for example see: http://lists.openstack.org/pipermail/openstack-dev/2016-February/086218.html
+or http://lists.openstack.org/pipermail/openstack-discuss/2019-March/003574.html )
 This will raise the issue to the wider community and attract at least the same
 (most likely more) attention than discussing it during the irc meeting. The
 only downside is that it might take more time to get a response, given the