Update user-assigned identity role info

Updated Storage Blob Data Contributor to Storage Blob Data Owner.
With Storage Blob Data Contributor role of MSI on GEN2, error will happen when creating HDInsight

Author: cicicao

articles/hdinsight/hdinsight-hadoop-use-data-lake-storage-gen2-azure-cli.md

@@ -65,10 +65,10 @@ az storage account create --name <STORAGEACCOUNTNAME> \
     --kind StorageV2 --hierarchical-namespace true
 ```
 
-Next, sign in to the portal. Add the new user-assigned managed identity to the **Storage Blob Data Contributor** role on the storage account. This step is described in step 3 under [Using the Azure portal](hdinsight-hadoop-use-data-lake-storage-gen2.md).
+Next, sign in to the portal. Add the new user-assigned managed identity to the **Storage Blob Data Owner** role on the storage account. This step is described in step 3 under [Using the Azure portal](hdinsight-hadoop-use-data-lake-storage-gen2.md).
 
  > [!IMPORTANT]
- > Ensure that your storage account has the user-assigned identity with **Storage Blob Data Contributor** role permissions, otherwise cluster creation will fail.
+ > Ensure that your storage account has the user-assigned identity with **Storage Blob Data Owner** role permissions, otherwise cluster creation will fail.
 
 ```azurecli
 az deployment group create --name HDInsightADLSGen2Deployment \