minor fix to domains page

Author: commit111

docs/concepts/domains.mdx

@@ -30,7 +30,7 @@ https://<username>-<service-name>--<port>.defang.dev
 If you're using [Defang BYOC](./defang-byoc.md), your domain will be:
 
 ```
-https://<service-name>--<port>.username.defang.app
+https://<service-name>--<port>.<username>.defang.app
 ```
   </TabItem>
 </Tabs>
@@ -114,4 +114,3 @@ As of now, the Pulumi provider does not support [Defang BYOC](./defang-byoc.md)
 :::
   </TabItem>
 </Tabs>
-