message: Fix TensorFlow Lite for Microcontrollers speech training notebook
diff: "source": [
  "!toco \\\n",
  "--graph_def_file=/content/tiny_conv.pb --output_file=/content/tiny_conv.tflite \\\n",
  - "--input_shapes=1,1960 --input_arrays=Reshape_1 --output_arrays='labels_softmax' \\\n",
  + "--input_shapes=1,49,40,1 --input_arrays=Reshape_2 --output_arrays='labels_softmax' \\\n",
  "--inference_type=QUANTIZED_UINT8 --mean_values=0 --std_dev_values=9.8077"
  ],
  "execution_count": 0,
  