update to use gRPC Authors with copyright.

Author: rmehta19

s2a/src/main/proto/grpc/gcp/common.proto

@@ -1,17 +1,20 @@
-// Copyright 2022 Google LLC
+// Copyright 2024 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
 //
-//    https://www.apache.org/licenses/LICENSE-2.0
+//     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.
 
+// The canonical version of this proto can be found at
+// https://github.com/grpc/grpc-proto/blob/master/grpc/gcp/s2a/common.proto
+
 syntax = "proto3";
 
 package grpc.gcp;

s2a/src/main/proto/grpc/gcp/s2a_context.proto

@@ -14,6 +14,7 @@
 
 // The canonical version of this proto can be found at
 // https://github.com/grpc/grpc-proto/blob/master/grpc/gcp/s2a/s2a_context.proto
+
 syntax = "proto3";
 
 package grpc.gcp;