Update switching-endpoints.md

Fixing right-paren on AzureOpenAI object similar to other PR #117514

Author: aroffe99

articles/ai-services/openai/how-to/switching-endpoints.md

@@ -52,7 +52,7 @@ client = AzureOpenAI(
     api_key=os.getenv("AZURE_OPENAI_KEY"),  
     api_version="2023-10-01-preview",
     azure_endpoint = os.getenv("AZURE_OPENAI_ENDPOINT")
-    )
+)
 ```
 
 </td>