Update sequence.md

units/sequence.md

@@ -18,7 +18,7 @@
 ## Content
 
 * [Sequence Models](https://en.diveintodeeplearning.org/chapter_recurrent-neural-networks/sequence.html)
-* [Language Models](https://en.diveintodeeplearning.org/chapter_recurrent-neural-networks/lang-model.html)
+* [Language Models](https://en.diveintodeeplearning.org/chapter_recurrent-neural-networks/language-models-and-dataset.html)
 * [Recurrent Neural Networks](https://en.diveintodeeplearning.org/chapter_recurrent-neural-networks/rnn.html)
 * [Text Preprocessing](https://en.diveintodeeplearning.org/chapter_recurrent-neural-networks/text-preprocessing.html)