Changelog update (#44038)

* Changelog update

* Resolved comment

Author: howieleung

sdk/ai/azure-ai-projects/CHANGELOG.md

@@ -15,6 +15,8 @@
 
 ### Sample updates
 * Added `finetuning` samples for operations create, retrieve, list, list_events, list_checkpoints, cancel, pause and resume. Also, these samples includes various finetuning techniques like Supervised (SFT), Reinforcement (RFT) and Direct performance optimization (DPO).
+* In all most samples, credential, project client, and openai client are combined into one context manager.
+* Remove `await` while calling `get_openai_client()` for samples using asynchronous clients. 
 
 ## 2.0.0b1 (2025-11-11)