misc updated

Signed-off-by: Lei Liu <lei01.liu@horizon.ai>

weed/server/master_grpc_server_volume.go

@@ -78,7 +78,7 @@ func (ms *MasterServer) Assign(ctx context.Context, req *master_pb.AssignRequest
 		}
 		ms.vgLock.Lock()
 		if !ms.Topo.HasWritableVolume(option) {
-			if _, err = ms.vg.AutomaticGrowByType(option, ms.grpcDialOpiton, ms.Topo); err != nil {
+			if _, err = ms.vg.AutomaticGrowByType(option, ms.grpcDialOption, ms.Topo); err != nil {
 				ms.vgLock.Unlock()
 				return nil, fmt.Errorf("Cannot grow volume group! %v", err)
 			}