Don't advise people to use additional registries over oreg_url

inventory/byo/hosts.origin.example

@@ -93,13 +93,11 @@ openshift_release=v1.2
 # Skip upgrading Docker during an OpenShift upgrade, leaves the current Docker version alone.
 # docker_upgrade=False
 
-# Alternate image format string. If you're not modifying the format string and
-# only need to inject your own registry you may want to consider
-# openshift_docker_additional_registries instead
+# Alternate image format string, useful if you've got your own registry mirror
 #oreg_url=example.com/openshift3/ose-${component}:${version}
 # If oreg_url points to a registry other than registry.access.redhat.com we can
 # modify image streams to point at that registry by setting the following to true
-#openshift_examples_modify_imagestreams=True
+#openshift_examples_modify_imagestreams=true
 
 
 # Origin copr repo

inventory/byo/hosts.ose.example

@@ -93,13 +93,11 @@ openshift_release=v3.2
 # Skip upgrading Docker during an OpenShift upgrade, leaves the current Docker version alone.
 # docker_upgrade=False
 
-# Alternate image format string. If you're not modifying the format string and
-# only need to inject your own registry you may want to consider
-# openshift_docker_additional_registries instead
+# Alternate image format string, useful if you've got your own registry mirror
 #oreg_url=example.com/openshift3/ose-${component}:${version}
 # If oreg_url points to a registry other than registry.access.redhat.com we can
 # modify image streams to point at that registry by setting the following to true
-#openshift_examples_modify_imagestreams=True
+#openshift_examples_modify_imagestreams=true
 
 # Additional yum repos to install
 #openshift_additional_repos=[{'id': 'ose-devel', 'name': 'ose-devel', 'baseurl': 'http://example.com/puddle/build/AtomicOpenShift/3.1/latest/RH7-RHOSE-3.0/$basearch/os', 'enabled': 1, 'gpgcheck': 0}]