Update whats-new.md

Author: aahill

articles/cognitive-services/language-service/whats-new.md

@@ -23,7 +23,8 @@ Azure Cognitive Service for Language is updated on an ongoing basis. To stay up-
   * China East 2 (Authoring and Prediction)
   * China North 2 (Prediction)
 * New model evaluation updates for Conversational language understanding and Orchestration workflow.
-
+* New model version ('2023-01-01-preview') for Text Analytics for health featuring new [entity categories](./text-analytics-for-health/concepts/health-entity-categories.md) for social determinants of health
+* 
 ## December 2022
 
 * New version (v5.2.0-beta.1) of the text analysis client library is available in preview for C#/.NET: