CHANGELOG: fix typo "--peer-cert-allowed-cn"
CHANGELOG: fix typo "--peer-cert-allowed-cn"

Signed-off-by: Gyuho Lee <3454051ee3341eb69bdf6fca40899cdad4d86496@gmail.com>

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