[skip ci] Add the comments to service (#13411)

Signed-off-by: Njingkl <jingjing.jia@zilliz.com>

internal/distributed/proxy/service.go

@@ -366,6 +366,7 @@ func (s *Server) HasPartition(ctx context.Context, request *milvuspb.HasPartitio
 	return s.proxy.HasPartition(ctx, request)
 }
 
+// LoadPartitions notifies Proxy to load the partitions data
 func (s *Server) LoadPartitions(ctx context.Context, request *milvuspb.LoadPartitionsRequest) (*commonpb.Status, error) {
 	return s.proxy.LoadPartitions(ctx, request)
 }