[Doctrine] update config reference doc with PHP examples#19596

vinceAmstoutz wants to merge 3 commits intosymfony:6.4symfony/symfony-docs:6.4from

vinceAmstoutz:improve_doctrine_config_reference_by_adding_php_synthaxvinceAmstoutz/symfony-docs:improve_doctrine_config_reference_by_adding_php_synthaxCopy head branch name to clipboard