mkRedundantOption: add two spaces for newline

flake.nix

@@ -55,10 +55,7 @@
 
     mkRedundantOption = name: value: attrs: lib.mkOption {
       inherit (attrs) type default;
-      description = ''
+      description = "${attrs.description}  ${mkRedundantOptionDescription name value}";
-        ${attrs.description}
-        ${mkRedundantOptionDescription name value}
-      '';
     };
   };
 }