message: Fix instructions for micro_speech training
diff: @@ -559,7 +559,7 @@ To begin training, run the following:
  ```
  python tensorflow/tensorflow/examples/speech_commands/train.py \
  --model_architecture=tiny_conv --window_stride=20 --preprocess=micro \
  ---wanted_words="on,off" --silence_percentage=25 --unknown_percentage=25 \
  +--wanted_words="yes,no" --silence_percentage=25 --unknown_percentage=25 \
  --quantize=1 --verbosity=INFO --how_many_training_steps="15000,3000" \
  --learning_rate="0.001,0.0001" --summaries_dir=/tmp/retrain_logs \
  --data_dir=/tmp/speech_dataset --train_dir=/tmp/speech_commands_train
  