mcs/scheduling: fix typo (tikv#7333)

ref tikv#5839

Signed-off-by: Cabinfever_B <cabinfeveroier@gmail.com>

Co-authored-by: ti-chi-bot[bot] <108142056+ti-chi-bot[bot]@users.noreply.github.com>

pkg/mcs/scheduling/server/grpc_service.go

@@ -65,7 +65,7 @@ type Service struct {
 	*Server
 }
 
-// NewService creates a new TSO service.
+// NewService creates a new scheduling service.
 func NewService[T ConfigProvider](svr bs.Server) registry.RegistrableService {
 	server, ok := svr.(*Server)
 	if !ok {
@@ -118,7 +118,7 @@ func (s *heartbeatServer) Recv() (*schedulingpb.RegionHeartbeatRequest, error) {
 	return req, nil
 }
 
-// RegionHeartbeat implements gRPC PDServer.
+// RegionHeartbeat implements gRPC SchedulingServer.
 func (s *Service) RegionHeartbeat(stream schedulingpb.Scheduling_RegionHeartbeatServer) error {
 	var (
 		server   = &heartbeatServer{stream: stream}
@@ -168,7 +168,7 @@ func (s *Service) RegionHeartbeat(stream schedulingpb.Scheduling_RegionHeartbeat
 	}
 }
 
-// StoreHeartbeat implements gRPC PDServer.
+// StoreHeartbeat implements gRPC SchedulingServer.
 func (s *Service) StoreHeartbeat(ctx context.Context, request *schedulingpb.StoreHeartbeatRequest) (*schedulingpb.StoreHeartbeatResponse, error) {
 	c := s.GetCluster()
 	if c == nil {
@@ -202,7 +202,7 @@ func (s *Service) SplitRegions(ctx context.Context, request *schedulingpb.SplitR
 	}, nil
 }
 
-// ScatterRegions implements gRPC PDServer.
+// ScatterRegions implements gRPC SchedulingServer.
 func (s *Service) ScatterRegions(ctx context.Context, request *schedulingpb.ScatterRegionsRequest) (*schedulingpb.ScatterRegionsResponse, error) {
 	c := s.GetCluster()
 	if c == nil {
@@ -261,7 +261,7 @@ func (s *Service) GetOperator(ctx context.Context, request *schedulingpb.GetOper
 	}, nil
 }
 
-// AskBatchSplit implements gRPC PDServer.
+// AskBatchSplit implements gRPC SchedulingServer.
 func (s *Service) AskBatchSplit(ctx context.Context, request *schedulingpb.AskBatchSplitRequest) (*schedulingpb.AskBatchSplitResponse, error) {
 	c := s.GetCluster()
 	if c == nil {