ma vim: add remarks about vim-nix

makefu/2configs/vim.nix

@@ -127,6 +127,7 @@ in {
         { names = [ "undotree"
           # "YouCompleteMe"
           "vim-better-whitespace" ]; }
+        # vim-nix handles indentation better but does not perform sanity
         { names = [ "vim-addon-nix" ]; ft_regex = "^nix\$"; }
       ];