message: Fix broken image link in TensorFlow Lite's Docs
  I fixed the link of image in the same way as other documents in [tensorflow/tensorflow/docs_src/](https://github.com/tensorflow/tensorflow/tree/master/tensorflow/docs_src).
diff: @@ -155,7 +155,7 @@ retraining for both floating point and quantized inference.
  The following diagram shows the architectural design of TensorFlow Lite:
  -<img src = "/images/tflite-architecture.jpg">
  +![tensorflow lite architecture](https://www.tensorflow.org/images/tflite-architecture.jpg)
  Starting with a trained TensorFlow model on disk, you'll convert that model to
  the TensorFlow Lite file format (`.tflite`) using the TensorFlow Lite
  