message: Remove dead link to "quantization".
  What it pointed to previously (TFMOT post-training docs) didn't provide additional useful information beyond this paragraph itself. For more on "what quantization is", the available information is available as people need it (when they use the different forms of quantization tools)
diff: @@ -79,10 +79,9 @@ with TensorFlow Lite.
  ### Quantization
  -[Quantization](https://www.tensorflow.org/model_optimization/guide/quantization)
  -works by reducing the precision of the numbers used to represent a model's
  -parameters, which by default are 32-bit floating point numbers. This results in
  -a smaller model size and faster computation.
  +Quantization works by reducing the precision of the numbers used to represent a
  +model's parameters, which by default are 32-bit floating point numbers. This
  +results in a smaller model size and faster computation.
  The following types of quantization are available in TensorFlow Lite:
  