Update type hint for RegistryRegionDetails (Azure#27784)

* Updating the Changelog for December release

* Update sdk/ml/azure-ai-ml/CHANGELOG.md

Co-authored-by: Neehar Duvvuri <[email protected]>

* Addressing the comments

* Include more entries in change log

* Update type hint for RegistryRegionDetails

* Update type hint for RegistryRegionDetails

Co-authored-by: Neehar Duvvuri <[email protected]>

Author: harneetvirk

sdk/ml/azure-ai-ml/azure/ai/ml/entities/_registry/registry_support_classes.py

@@ -146,7 +146,7 @@ def __init__(
             can either be a single string representing the arm_resource_id of
             a user-created storage account, or an entire
             SystemCreatedStorageAccount object.
-        :type storage_account_details: List[Union[str, SystemCreatedStorageAccount]]
+        :type storage_account_details: Union[List[str], SystemCreatedStorageAccount]
         """
         self.acr_config = acr_config
         self.location = location