ssh: provide code snippet in enableDefaultConfig description

modules/programs/ssh.nix

@@ -559,6 +559,21 @@ in
       description = ''
         Whether to enable or not the old default config values.
         This option will become deprecated in the future.
+        For an equivalent, copy and paste the following
+        code snippet in your config:
+
+        programs.ssh.matchBlocks."*" = {
+          forwardAgent = false;
+          addKeysToAgent = "no";
+          compression = false;
+          serverAliveInterval = 0;
+          serverAliveCountMax = 3;
+          hashKnownHosts = false;
+          userKnownHostsFile = "~/.ssh/known_hosts";
+          controlMaster = "no";
+          controlPath = "~/.ssh/master-%r@%n:%p";
+          controlPersist = "no";
+        };
       '';
     };
   };