[HTML Sanitizer] PHP-Config with fluent interface examples don't work

[spackmat]

Hey, we just implemented the new HTML Sanitizer feature the first time and stumbled upon some not-working examples in the doctmentation:

https://symfony.com/doc/current/html_sanitizer.html#drop-attributes

The PHP-config examples state for some settings that a fluent interface is used, where the "Standalone Use" example show the actual variants with two parameters. For example the allowAttribute settings:

// that does not work:
// config/packages/framework.php
use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework) {
    $framework->htmlSanitizer()
        ->sanitizer('app.post_sanitizer')
            // allow "src' on <iframe> elements
            ->allowAttribute('src')
                ->element('iframe')

            // allow "data-attr" on all elements currently allowed
            ->allowAttribute('data-attr')
                ->element('*')
    ;
};

// that does work, like it is shown in the "Standalone Use" example:
// config/packages/framework.php
use Symfony\Config\FrameworkConfig;

return static function (FrameworkConfig $framework) {
    $framework->htmlSanitizer()
        ->sanitizer('app.post_sanitizer')
            // allow "src' on <iframe> elements
            ->allowAttribute('src', ['iframe'})

            // allow "data-attr" on all elements currently allowed
            ->allowAttribute('data-attr', '*')
    ;
};

Maybe that fluent interface came from a previous state and was removed later.