Fix bad package import 'azure.keyvault.secrets'

Author: mastloui-msft

articles/machine-learning/how-to-use-secrets-in-runs.md

@@ -65,7 +65,7 @@ Before following the steps in this article, make sure you have the following pre
 
     ```python
     from azure.identity import DefaultAzureCredential
-    from azure.keyvault.secret import SecretClient
+    from azure.keyvault.secrets import SecretClient
 
     credential = DefaultAzureCredential()