Merge pull request #1980 from mrbullwinkle/patch-12

[Azure OpenAI] Update evaluations.md - add East US2 support

Author: prmerger-automator[bot]

articles/ai-services/openai/how-to/evaluations.md

@@ -22,6 +22,7 @@ Azure OpenAI evaluation enables developers to create evaluation runs to test aga
 
 ### Regional availability
 
+- East US2
 - North Central US
 - Sweden Central
 - Switzerland West