Publish quantization-aware training docs.

PiperOrigin-RevId: 305281002

Author: alanchiao

tensorflow_model_optimization/g3doc/_book.yaml

@@ -33,6 +33,12 @@ upper_tabs:
         path: /model_optimization/guide/pruning/train_sparse_models
 
       - heading: Quantization
+      - title: Quantization aware training overview
+        path: /model_optimization/guide/quantization/training
+      - title: Quantization aware training example
+        path: /model_optimization/guide/quantization/training_example
+      - title: Quantization aware training comprehensive guide
+        path: /model_optimization/guide/quantization/training_comprehensive_guide
       - title: Post-training quantization
         path: /model_optimization/guide/quantization/post_training
 

tensorflow_model_optimization/g3doc/guide/optimize_further.md

@@ -15,4 +15,4 @@ tune.
 Training time tools available for you to try:
 
 * [Weight pruning](./pruning/)
-* Quantization (coming soon!)
+* [Quantization] (./quantization/training)