message: Restore the new description.
diff: @@ -34,7 +34,10 @@ message VmConfig {
  // The Wasm code that Envoy will execute.
  config.core.v3.AsyncDataSource code = 3;
  - // The Wasm configuration used in initialization of a new VM (proxy_on_start).
  + // The Wasm configuration used in initialization of a new VM
  + // (proxy_on_start). `google.protobuf.Struct` is serialized as JSON before
  + // passing it to the plugin. `google.protobuf.BytesValue` and
  + // `google.protobuf.StringValue` are passed directly without the wrapper.
  google.protobuf.Any configuration = 4;
  // Allow the wasm file to include pre-compiled code on VMs which support it.
  