fix the broken links

scenarios/question_answering/pretrained-BERT-SQuAD-deep-dive-aml.ipynb

@@ -716,7 +716,7 @@
    ],
    "source": [
     "urllib.request.urlretrieve('https://raw.githubusercontent.com/allenai/bi-att-flow/498c8026d92a8bcf0286e2d216d092d444d02d76/squad/evaluate-v1.1.py', filename= project_folder + '\\\\evaluate_squad.py')\n",
-    "urllib.request.urlretrieve('https://raw.githubusercontent.com/microsoft/AzureML-BERT/master/PyTorch/azureml_bert_util.py', filename= project_folder + '\\\\azureml_bert_util.py')"
+    "urllib.request.urlretrieve('https://raw.githubusercontent.com/microsoft/AzureML-BERT/master/finetune/PyTorch/azureml_bert_util.py', filename= project_folder + '\\\\azureml_bert_util.py')"
    ]
   },
   {