Update changelog (Azure#28240)

* Update changelog

* update

Author: xiangyan99

sdk/identity/azure-identity/CHANGELOG.md

@@ -1,21 +1,21 @@
 # Release History
 
-## 1.13.0b1 (Unreleased)
+## 1.13.0b1 (2023-01-10)
 
 ### Features Added
 
 - Added Windows Web Account Manager (WAM) Brokered Authentication support. ([#23687](https://github.com/Azure/azure-sdk-for-python/issues/23687))
 
 ### Breaking Changes
 
+> These changes do not impact the API of stable versions such as 1.12.0.
+> Only code written against a beta version such as 1.12.0b1 may be affected.
 - Replaced `validate_authority` with `instance_discovery`. Now instead of setting validate_authority=False to disable authority validation and instance discovery, you need to use instance_discovery=False.
 
 ### Bugs Fixed
 
 - Fixed an issue where `AzureCliCredential` would return the wrong error message when the Azure CLI was not installed on non-English consoles. ([#27965](https://github.com/Azure/azure-sdk-for-python/issues/27965))
 
-### Other Changes
-
 ## 1.12.0 (2022-11-08)
 
 ### Bugs Fixed