highlight: :h reference in single quotes

modules/neovim/init/highlight.nix

@@ -92,19 +92,17 @@ in {
             "NONE"
           ]));
           default = null;
-          description = "The cterm arguments to use. See :h highlight-args";
+          description = "The cterm arguments to use. See ':h highlight-args'";
         };
         force = mkBoolOption "force update";
       };
     });
     default = {};
-    example = ''
+    example = {
-      {
       SignColumn = {
         bg = "#282828";
       };
-      }
+    };
-    '';
     description = "Custom highlights to apply";
   };