Update changelog (#36827)

Author: xiangyan99

sdk/identity/azure-identity/CHANGELOG.md

@@ -1,17 +1,10 @@
 # Release History
 
-## 1.18.0b2 (Unreleased)
+## 1.18.0b2 (2024-08-09)
 
 ### Features Added
 
-### Breaking Changes
-
-### Bugs Fixed
-
-- Fixed an issue where the `send_certificate_chain` keyword argument was not being honored when using certs with the synchronous `OnBehalfOfCredential`. ([#36810](https://github.com/Azure/azure-sdk-for-python/pull/36810))
-
-### Other Changes
-
+- Added support of `send_certificate_chain` keyword argument when using certs with the synchronous `OnBehalfOfCredential`. ([#36810](https://github.com/Azure/azure-sdk-for-python/pull/36810))
 - `AzurePowerShellCredential` now supports using secure strings when authenticating with PowerShell. ([#36653](https://github.com/Azure/azure-sdk-for-python/pull/36653))
 
 ## 1.18.0b1 (2024-07-16)