Add seq2seq to TOC and fix the api-generator. (#1037)

* Add seq2seq to TOC.

Author: MarkDaoust

docs/tutorials/_toc.yaml

@@ -16,3 +16,5 @@ toc:
   path: /addons/tutorials/optimizers_conditionalgradient
 - title: TQDM Progress Bar
   path: /addons/tutorials/tqdm_progress_bar
+- title: Seq2Seq for Translation
+  path: /addons/tutorials/networks_seq2seq_nmt

tools/docs/build_docs.py

@@ -30,14 +30,8 @@
 import tensorflow_addons as tfa
 
 from tensorflow_docs.api_generator import generate_lib
-from tensorflow_docs.api_generator import parser
 from tensorflow_docs.api_generator import public_api
 
-from tensorflow.python.util import tf_inspect
-
-# Use tensorflow's `tf_inspect`, which is aware of `tf_decorator`.
-parser.tf_inspect = tf_inspect
-
 PROJECT_SHORT_NAME = "tfa"
 PROJECT_FULL_NAME = "TensorFlow Addons"