vlan_attachment - fixes in README
vlan_attachment - fixes in README

aljim/deploymentmanager-samples,aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples