Clean up package-info.java in services/protobuf.services.

services/src/main/java/io/grpc/protobuf/services/package-info.java

@@ -0,0 +1,20 @@
+/*
+ * Copyright 2020 The gRPC Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Service definitions and utilities with protobuf dependency for the pre-defined gRPC services.
+ */
+package io.grpc.protobuf.services;

services/src/main/java/io/grpc/services/package-info.java

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+// TODO(chengyuanzhang): update description after deleting classes with protobuf dependency that
+//  have already been moved.
 /**
  * Service definitions and utilities for the pre-defined gRPC services.
  */