Syntax highlighting should not display attributes as comments

[alexislefebvre]

Description
Right now the attributes are displayed like comments:

Example

Source: https://api-platform.com/docs/core/dto/#the-entity

It would be nice to show attributes with a different style to ease reading, like Symfony doc do, by using one color for #[Route()] and different colors for the arguments:

Source: https://symfony.com/doc/current/routing.html#creating-routes-as-attributes

[alexislefebvre]

It looks like the doc rely on Chroma for syntax highlighting, and it doesn’t support PHP attributes yet:

• PHP 8 attributes are highlighted as comments alecthomas/chroma#1093