updated docs for replication factor
updated docs for replication factor

kairosdb/kairosdb,ppbizapps/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,kairosdb/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,ppbizapps/kairosdb,ppbizapps/kairosdb,kairosdb/kairosdb,kairosdb/kairosdb