Use "closure-style" PHP configuration format in code examples #13965
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I noticed that we still use the "old" way of defining configuration in PHP in some code examples even though the new format has been available for quite a few years now: https://symfony.com/blog/new-in-symfony-3-4-php-based-configuration-for-services-and-routes
Seeing two styles of writing configuration in PHP might be confusing for beginners, so I've updated the examples here to use the new format.
There's probably still a number of places where the older format is used - I'll be sure to submit more PRs as I encouter them :)