doc improvement suggestion for `treesitter-query-modeline`

[michaelrommel]

Small issue in the website version of the treesitter-query-modeline section: The example should show two versions of modelines separated with a single blank line. On the website this is rendered in one continuous box, it might be more readable, if it would have been split into two separate boxes:

[clason]

The website is autogenerated from the docs; so this is an issue for neovim/neovim. I'll just fix it there.