Revert "mkRedundantOption: use lib.literalMd to hopefully format correctly"

This reverts commit 9846cf8d3b.

flake.nix

@@ -55,13 +55,7 @@
 
     mkRedundantOption = name: value: attrs: lib.mkOption {
       inherit (attrs) type default;
-      description = lib.literalMD ''
+      description = "${attrs.description}\n\n!!! warning\n    ${mkRedundantOptionDescription name value}";
-        ${attrs.description}
-
-
-        !!! warning
-            ${mkRedundantOptionDescription name value}";
-      '';
     };
   };
 }