Merge pull request #9206 from...

Merge pull request #9206 from soltanmm-google/is-the-world-is-moving-too-fast-or-am-I-moving-too-slow

Add `auto-gen`d comment to `_pb2_grpc.py` files

src/compiler/python_generator.cc

@@ -724,6 +724,9 @@ pair<bool, grpc::string> PrivateGenerator::GetGrpcServices() {
     out = &out_printer;
 
     if (generate_in_pb2_grpc) {
+      out->Print(
+          "# Generated by the gRPC Python protocol compiler plugin. "
+          "DO NOT EDIT!\n");
       if (!PrintPreamble()) {
         return make_pair(false, "");
       }