Replace upload() method

Addresses git issue https://github.com/MicrosoftDocs/azure-docs/issues/89651

Author: nibaccam

articles/machine-learning/tutorial-1st-experiment-bring-data.md

@@ -169,11 +169,13 @@ To run this script in Azure Machine Learning, you need to make your training dat
     ```python
     # upload-data.py
     from azureml.core import Workspace
+    from azureml.core import Dataset
+    from azureml.data.datapath import DataPath
+    
     ws = Workspace.from_config()
     datastore = ws.get_default_datastore()
-    datastore.upload(src_dir='./data',
-                     target_path='datasets/cifar10',
-                     overwrite=True)
+    Dataset.File.upload_directory(src_dir='data', 
+                                  target=DataPath(datastore, "datasets/cifar10")
 
     ```