Syntax highlighting should not display attributes as comments

**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