Update index.mdx (#9099)

Author: dalnoki

docs/product/integrations/notification-incidents/msteams/index.mdx

@@ -27,7 +27,7 @@ Sentry owner, manager, or admin permissions are required to install this integra
   to finish installation.
 </Alert>
 
-3. You should see a welcome message in the "General" channel within a few seconds. Click "Complete Setup".
+3. You should see a welcome message in the "General" channel within a few seconds. The welcome message will always appear in the "General" channel, even if you intend to use the integration in another channel. Click "Complete Setup".
 
    ![Welcome to Microsoft Teams message](/product/integrations/notification-incidents/msteams/msteams-welcome-message.png)