docs: update vale.sh links

[Amar1729]

Update some outdated links for https://vale.sh/

There may have been some updates to vale since this diagnostic was written. It generally requires you to run vale sync once right after you create your initial .vale.ini, to download styles. Is that ok for none-ls (I'm not too familiar with how this plugin usually works yet), or should the diagnostic be reworked to auto-call vale sync as long as a .vale.ini exists?

[mochaaP]

LGTM.

🤔 As for the vale sync thing, I generally prefer that's something the user should take care of (like installing ESLint presets from NPM).