[Config] add cautionary note on ini file loader limitation#3431

weaverryan merged 3 commits intosymfony:2.3symfony/symfony-docs:2.3from

cordoval:2517-document-the-limitation-of-the-dependency-injection-ini-loadercordoval/symfony-docs:2517-document-the-limitation-of-the-dependency-injection-ini-loaderCopy head branch name to clipboard