Fix typo in \Slim\App inline documentation
Fix typo in \Slim\App inline documentation

akrabat/Slim,opengeek/Slim,dopesong/Slim,foxyantho/Slim,AndrewCarterUK/Slim,RealSelf/Slim,iinux/Slim,designermonkey/Slim,iinux/Slim,jaapverloop/Slim,samsonasik/Slim,iinux/Slim,mnapoli/Slim,juliangut/Slim,JoeBengalen/Slim,slimphp/Slim,feryardiant/slim,somjit2514/basic,Sam-Burns/Slim,pine3ree/Slim