Fixed NER url

examples/named_entity_recognition/README.md

@@ -36,4 +36,4 @@ can also be labeled with custom entities as required by the use case.
 
 |Notebook|Environment|Description|Dataset|Language| 
 |---|:---:|---|---|---|
-|[BERT](ner_wikigold_bert.ipynb)|Local| Fine-tune a pretrained BERT model for token classification.|[wikigold](https://www.aclweb.org/anthology/W09-3302)| English | 
+|[BERT](ner_wikigold_transformer.ipynb)|Local| Fine-tune a pretrained BERT model for token classification.|[wikigold](https://www.aclweb.org/anthology/W09-3302)| English |