Adding "ID" to Microsoft Entra reference

Suggesting to update "Microsoft Entra" to "Microsoft Entra ID" to reflect correct brand name, as per this: https://www.microsoft.com/en-gb/security/business/identity-access/microsoft-entra-id

Author: LazaUK

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

@@ -61,7 +61,7 @@ client = AzureOpenAI(
 
 <a name='azure-active-directory-authentication'></a>
 
-### Microsoft Entra authentication
+### Microsoft Entra ID authentication
 
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