Fix links in nlp readme.

PiperOrigin-RevId: 444158657

official/nlp/README.md

@@ -35,7 +35,10 @@ research ideas. Detailed intructions can be found in READMEs in each folder.
 
 We provide SoTA model implementations, pre-trained models, training and
 evaluation examples, and command lines. Detail instructions can be found in the
-READMEs for specific papers.
+READMEs for specific papers. Below are some papers implemented in the
+repository and more NLP projects can be found in the
+[`projects`](https://github.com/tensorflow/models/tree/master/official/projects)
+folder:
 
 1.  [BERT](MODEL_GARDEN.md#available-model-configs): [BERT: Pre-training of Deep Bidirectional Transformers for
     Language Understanding](https://arxiv.org/abs/1810.04805) by Devlin et al.,
@@ -43,10 +46,10 @@ READMEs for specific papers.
 2.  [ALBERT](MODEL_GARDEN.md#available-model-configs):
     [A Lite BERT for Self-supervised Learning of Language Representations](https://arxiv.org/abs/1909.11942)
     by Lan et al., 2019
-3.  [XLNet](xlnet):
+3.  [XLNet](MODEL_GARDEN.md):
     [XLNet: Generalized Autoregressive Pretraining for Language Understanding](https://arxiv.org/abs/1906.08237)
     by Yang et al., 2019
-4.  [Transformer for translation](transformer):
+4.  [Transformer for translation](MODEL_GARDEN.md#available-model-configs):
     [Attention Is All You Need](https://arxiv.org/abs/1706.03762) by Vaswani et
     al., 2017