message: Update documentation for audio classifiers.
  We have a audio classifier desktop demo ready in the demo folder.
  Also metadata is mandatory for this API.
diff: @@ -33,8 +33,7 @@ namespace audio {
  // Performs classification on audio clips.
  //
  -// The API expects a TFLite model with optional, but strongly recommended,
  -// TFLite Model Metadata.
  +// This API expects a TFLite model with metadata.
  //
  // Input tensor:
  // (kTfLiteFloat32)
  @@ -52,8 +51,6 @@ namespace audio {
  // `ImageClassifierOptions` used at creation time ("en" by default, i.e.
  // English). If none of these are available, only the `index` field of the
  // results will be filled.
  -//
  -// TODO(b/182535933): Add a model example and demo comments here.
  class AudioClassifier
  : public tflite::task::core::BaseTaskApi<ClassificationResult,
  const AudioBuffer&> {
  