Update ebs.md
Update ebs.md

Document the usage of tags in EBS
aruneli/convoy,rancherio/rancher-volume,rancher/convoy,jinuxstyle/convoy,rancherio/volmgr,aruneli/convoy,aruneli/convoy,medallia/convoy,rancherio/volmgr,nickvanw/convoy,rancher/rancher-volume,nickvanw/convoy,medallia/convoy,rancherio/volmgr,rancher/rancher-volume,jinuxstyle/convoy,rancher/convoy,jinuxstyle/convoy,rancherio/rancher-volume,rancher/convoy,medallia/convoy,nickvanw/convoy,rancherio/rancher-volume,rancher/rancher-volume