Remove manual internal TLS config info

Automatic internal config has been in place for a long time.
Discussed with David Phillips and decided to remove this
last hint that manual config is even possible.

docs/src/main/sphinx/admin/properties-http-server.md

@@ -181,7 +181,7 @@ cluster share and use to authenticate within the cluster. See
 - **Default value:** `true`
 
 Enable use of the HTTP/2 protocol for internal communication for enhanced
-scalability compared to HTTP/1.1. Only turn this feature off, if you encounter
+scalability compared to HTTP/1.1. Only turn this feature off if you encounter
 issues with HTTP/2 usage within the cluster in your deployment.
 
 ### `internal-communication.https.required`

docs/src/main/sphinx/security/internal-communication.md

@@ -99,16 +99,6 @@ configuration identical on all cluster nodes.
 Certificates are automatically created and used to ensure all communication
 inside the cluster is secured with TLS.
 
-:::{warning}
-Older versions of Trino required you to manually manage all the certificates
-on the nodes. If you upgrade from this setup, you must remove the following
-configuration properties:
-
-- `internal-communication.https.keystore.path`
-- `internal-communication.https.truststore.path`
-- `node.internal-address-source`
-:::
-
 ### Performance with SSL/TLS enabled
 
 Enabling encryption impacts performance. The performance degradation can vary