docs: remove schema from the listener configuration (#1385)

Author: r-vasquez

modules/manage/pages/security/listener-configuration.adoc

@@ -92,7 +92,7 @@ redpanda:
 
   advertised_kafka_api:
     - name: tls_listener
-      address: https://kafka.example.com
+      address: redpanda.example.com
       port: 9094
 
   kafka_api_tls:
@@ -104,7 +104,7 @@ redpanda:
       require_client_auth: true
 ----
 
-Ensure `kafka.example.com` matches the SAN in `broker.crt` and that clients trust the `ca.crt`.
+Ensure `redpanda.example.com` matches the SAN in `broker.crt` and that clients trust the `ca.crt`.
 
 == Mixed-mode authentication with multiple listeners