PHP configuration not showing equivalent to `when@dev`

[GromNaN]

This mailer configuration example is non equivalent to the Yaml config.

symfony-docs/mailer.rst

Lines 2102 to 2106 in 50f1f4d

	return static function (FrameworkConfig $framework): void {
	// ...
	$framework->mailer()
	->dsn('null://null');
	};

It should be like this:

symfony-docs/configuration.rst

Lines 519 to 534 in 50f1f4d

	return static function (WebpackEncoreConfig $webpackEncore, ContainerConfigurator $container): void {
	$webpackEncore
	->outputPath('%kernel.project_dir%/public/build')
	->strictMode(true)
	->cache(false)
	;
	// cache is enabled only in the "prod" environment
	if ('prod' === $container->env()) {
	$webpackEncore->cache(true);
	}
	// disable strict mode only in the "test" environment
	if ('test' === $container->env()) {
	$webpackEncore->strictMode(false);
	}

The new syntax

namespace Symfony\Config;

return new FrameworkConfig([
    'when@dev' =>
        'framework' => [
            'mailer' => [
                'dsn' => 'null://null',
            ],
        ],
    ],
]);