Update examples/reverse-proxies/caddy2-in-container/README.md

Co-authored-by: Slavi Pantaleev <slavi@devture.com>

examples/reverse-proxies/caddy2-in-container/README.md

@@ -17,4 +17,4 @@ And adjust the `docker-compose.yaml` of Caddy's. See [examples/reverse-proxies/c
 You can either just use the [Caddyfile](Caddyfile) directly or append its content to your own Caddyfile.
 In both cases make sure to replace all the `example.tld` domains with your own domain.
 
-This example does not include additional services like element, but you should be able copy the first block and replace the matrix subdomain with the additional services subdomain. I have not tested this though.
+This example does not include additional services like Element, but you should be able copy the first block and replace the `matrix.` subdomain with the subdomain of the some other service (e.g. `element.`).