[backup] fix typo

machines/modules/malobeo/backup.nix

@@ -43,14 +43,14 @@ in
           };
         };
       })));
-      description = '''
+      description = ''
           Hostname with list of datasets to backup. This option should be defined on hosts that will store backups.
 
           It is necessary to add the machines that get backed up to known hosts.
           This can be done for example systemwide using 
           programs.ssh.knownHosts."10.100.0.101" = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIHqp2/YiiIhai7wyScGZJ20gtrzY+lp4N/8unyRs4qhc";
           Or set it for the syncoid user directly.
-        ''';
+        '';
     };
 
     sshKey = mkOption {