message: Fix keras_lstm.ipynb typos
diff: "The CodeLab is very similar to the `tf.lite.experimental.nn.TFLiteLSTMCell`\n",
  "[CodeLab](https://github.com/tensorflow/tensorflow/blob/master/tensorflow/lite/experimental/examples/lstm/TensorFlowLite_LSTM_Keras_Tutorial.ipynb). However, with the control flow support in the experimental new converter, we can define the model with control flow directly without refactoring the code.\n",
  "\n",
  - "Also note: We're not trying to build the model to be a real world application, but only demonstrate how to use TensorFlow lite. You can a build a much better model using CNN models. For a more canonical lstm codelab, please see [here](https://github.com/keras-team/keras/blob/master/examples/imdb_lstm.py)."
  + "Also note: We're not trying to build the model to be a real world application, but only demonstrate how to use TensorFlow Lite. You can a build a much better model using CNN models. For a more canonical lstm codelab, please see [here](https://github.com/keras-team/keras/blob/master/examples/imdb_lstm.py)."
  ]
  },
  {
  "\n",
  "# Assert if the result of TFLite model is consistent with the TF model.\n",
  "np.testing.assert_almost_equal(expected, result)\n",
  - "print(\"Done. The result of TensorFlow matches the result of TensorFLow Lite.\")"
  + "print(\"Done. The result of TensorFlow matches the result of TensorFlow Lite.\")"
  ]
  },
  {
  