Documentation/op-guide: Fix missing docker volume commands and specifying the initial DATA_DIR usage
Documentation/op-guide: Fix missing docker volume commands and specifying the initial DATA_DIR usage

sinsharat/etcd,rnaveiras/etcd,ajityagaty/etcd,bdarnell/etcd,rnaveiras/etcd,whuwxl/etcd,ajityagaty/etcd,sebrandon1/etcd,cockroachdb/etcd,gyuho/etcd,heyitsanthony/etcd,joshix/etcd,vimalk78/etcd,li-ang/etcd,sebrandon1/etcd,glevand/coreos--etcd,whuwxl/etcd,etcd-io/etcd,ajityagaty/etcd,mqliang/etcd,mkumatag/etcd,xiang90/etcd,lorneli/etcd,cockroachdb/etcd,gyuho/etcd,mqliang/etcd,fanminshi/etcd,heyitsanthony/etcd,vimalk78/etcd,li-ang/etcd,dannysauer/etcd,mqliang/etcd,sinsharat/etcd,xiang90/etcd,bluebreezecf/etcd,etcd-io/etcd,mkumatag/etcd,joshix/etcd,akauppi/etcd,bluebreezecf/etcd,coreos/etcd,fanminshi/etcd,etcd-io/etcd,bdarnell/etcd,mkumatag/etcd,akauppi/etcd,dannysauer/etcd,coreos/etcd,lorneli/etcd,glevand/coreos--etcd,rnaveiras/etcd