Update docs/configuring-playbook-element-call.md

Co-authored-by: Suguru Hirahara <luixxiul@users.noreply.github.com>

docs/configuring-playbook-element-call.md

@@ -46,9 +46,10 @@ matrix_livekit_server_dev_key: 'your-secure-livekit-key'
 After configuring the playbook and potentially [adjusting your DNS records](#adjusting-dns-records), run the [installation](installing.md) command: `just install-all` or `just setup-all`
 
 ## Usage
-Once installed, Element Call integrates seamlessly with Matrix clients like Element Web. When the Element Call service is installed, the `/.well-known/matrix/client` file is also updated. A new `org.matrix.msc4143.rtc_foci` section is added to point to your JWT service URL (e.g., `https://sfu-jwt.DOMAIN`).
 
-Additionally, the `/.well-known/element/element.json` file is created to help Element clients discover the Element Call URL (e.g., `https://call.DOMAIN`).
+Once installed, Element Call integrates seamlessly with Matrix clients like Element Web. When the Element Call service is installed, the `/.well-known/matrix/client` file is also updated. A new `org.matrix.msc4143.rtc_foci` section is added to point to your JWT service URL (e.g., `https://sfu-jwt.example.com`).
+
+Additionally, the `/.well-known/element/element.json` file is created to help Element clients discover the Element Call URL (e.g., `https://call.example.com`).
 
 ## Required Firewall and Port Forwarding Rules