[skip ci] Fix golint for start in QueryCoord (#10747)

Signed-off-by: Ncai.zhang <cai.zhang@zilliz.com>

internal/distributed/querycoord/service.go

@@ -218,6 +218,7 @@ func (s *Server) startGrpcLoop(grpcPort int) {
 	}
 }
 
+// start starts QueryCoord's grpc service.
 func (s *Server) start() error {
 	return s.queryCoord.Start()
 }