12071 clarify implementation of single_instance in SMF services
Reviewed by: Robert Mustacchi <rm@fingolfin.org>

@@ -2,10 +2,12 @@
 <!DOCTYPE service_bundle SYSTEM "/usr/share/lib/xml/dtd/service_bundle.dtd.1">
 <!--
  Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  Use is subject to license terms.
 
+ Copyright 2019 Joyent, Inc.
+
  CDDL HEADER START
 
  The contents of this file are subject to the terms of the
  Common Development and Distribution License (the "License").
  You may not use this file except in compliance with the License.

@@ -48,12 +50,11 @@
         <instance name='default' enabled='true'>
 
         <!--
                 physical:default and physical:nwam are mutually exclusive.
                 Use a one-way dependency for now since two-way exclude_all
-                does not work; enforcement of single_instance in the future
-                will fix this.
+                does not work.
         -->
         <dependency
                 name='physical_nwam'
                 grouping='exclude_all'
                 restart_on='none'