Update CHANGELOG.md (#42229)

Author: lzchen

sdk/monitor/azure-monitor-opentelemetry-exporter/CHANGELOG.md

@@ -26,8 +26,8 @@
   ([#41954](https://github.com/Azure/azure-sdk-for-python/pull/41954))
 - Refactored Application Insights Sampler Code
   ([#42210](https://github.com/Azure/azure-sdk-for-python/pull/42210))
-
 - Support AI Foundry by Handling GEN_AI_SYSTEM Attributes with [Spec](https://github.com/aep-health-and-standards/Telemetry-Collection-Spec/blob/main/ApplicationInsights/genai_semconv_mapping.md) ([#41705](https://github.com/Azure/azure-sdk-for-python/pull/41705))
+- Distinguish Azure AI SDKs in statsbeats ([#42016](https://github.com/Azure/azure-sdk-for-python/pull/42016))
 
 ## 1.0.0b39 (2025-06-25)