Update smtp-authentication.md SMTP username example duplicate formatting

Pipe-delimited format also included dot-delimited format. Removed dot-delimited format from pipe-delimited format example.

Author: martinfletcher

articles/communication-services/quickstarts/email/send-email-smtp/smtp-authentication.md

@@ -79,8 +79,6 @@ username: <Azure Communication Services Resource name>.<Entra Application ID>.<E
 ```
 **Pipe-delimited Format:**
 ```
-username: <Azure Communication Services Resource name>.<Entra Application ID>.<Entra Tenant ID>
-OR
 username: <Azure Communication Services Resource name>|<Entra Application ID>|<Entra Tenant ID>
 ```