message: Improve comments in schema.fbs
diff: @@ -25,6 +25,9 @@ file_identifier "TFL3";
  // File extension of any written files.
  file_extension "tflite";
  +// IMPORTANT: All new members of tables, enums and unions must be added at the
  +// end to ensure backwards compatibility.
  +
  // The type of data stored in a tensor.
  enum TensorType : byte {
  FLOAT32 = 0,
  