Inform that this is part of core since Drupal 8

Updated project page.

Thanks for a fast answer @Liam Morland.

Though ... I would have placed it at the top, with a link to the documentation page, since most new users landing on the page will be building a new web site with Drupal 10, instead of placing it as a small notice at the bottom.

But that's just my personal preference, and you maintainers have the freedom to do as you see fit.

Automatically closed - issue fixed for 2 weeks with no activity.