message: Fixed the Example code in the doc.
  Fixed the unreference call in the example.
diff: @@ -95,7 +95,7 @@ TfLiteRegistration GetMyDelegateNodeRegistration() {
  kernel_registration.free = [](TfLiteContext* context, void* buffer) -> void {
  delete reinterpret_cast<MyDelegate*>(buffer);
  };
  - delegate_registration.init = [](TfLiteContext* context, const char* buffer,
  + kernel_registration.init = [](TfLiteContext* context, const char* buffer,
  size_t) -> void* {
  // In the node init phase, initialize MyDelegate instance
  const TfLiteDelegateParams* delegate_params =
  