docs: backport and make consistent (#6856)

docs/pages/config-reference.mdx

@@ -384,13 +384,14 @@ proxy_service:
     # optional: set a different public address for kubernetes access
     kube_public_addr: kube.example.com:3026
 
-    # Acquire an ACME TLS certificate.
-    # Note: the cluster name should match the 'public_addr' of Teleport.
+    # Get automatic certificate from Letsencrypt.org using ACME via TLS_ALPN-01 challenge.
+    # When using ACME, the cluster name must match the 'public_addr' of Teleport and 
+    # the 'proxy_service' must be publicly accessible over port 443.
     # Also set using the CLI command:
     # 'teleport configure --acme [email protected] --cluster-name=tele.example.com -o file' 
-    acme:
-      enabled: "yes"
-      email: example@example.com
+    #acme:
+    #  enabled: yes
+    #  email: "user@example.com"
 
 # This section configures the 'application service'
 app_service: