examples: use the correct variable name

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

inventory/byo/hosts.origin.example

@@ -111,7 +111,7 @@ openshift_release=v3.6
 # Instead of using docker, replacec it with cri-o
 # NOTE: This uses openshift_docker_systemcontainer_image_registry_override as it's override
 # just as container-engine does.
-#use_crio=False
+#openshift_docker_use_crio=False
 # Force the registry to use for the docker/crio system container. By default the registry
 # will be built off of the deployment type and ansible_distribution. Only
 # use this option if you are sure you know what you are doing!

inventory/byo/hosts.ose.example

@@ -111,7 +111,7 @@ openshift_release=v3.6
 # Install and run cri-o along side docker
 # NOTE: This uses openshift_docker_systemcontainer_image_registry_override as it's override
 # just as container-engine does.
-#use_crio=False
+#openshift_docker_use_crio=False
 # Force the registry to use for the container-engine/crio system container. By default the registry
 # will be built off of the deployment type and ansible_distribution. Only
 # use this option if you are sure you know what you are doing!