Fix doc root of symfony2 apps
Fix doc root of symfony2 apps

CHH/heroku-buildpack-php,penciu/apache,mraymond/heroku-buildpack-php,AlphaStaxLLC/heroku-buildpack-php-custom,ryosuzuki/php-buildpack,CHH/heroku-buildpack-php,mraymond/heroku-buildpack-php,AlphaStaxLLC/heroku-buildpack-php-custom,stof/heroku-buildpack-php,Scalingo/php-buildpack,AlphaStaxLLC/heroku-buildpack-php-custom,OKAMca/heroku-buildpack-php,briankilgore/heroku-buildpack-php-prod,penciu/apache,Scalingo/php-buildpack,OKAMca/heroku-buildpack-php,pierredup/packager-buildpack-php,Scalingo/php-buildpack,stof/heroku-buildpack-php,jstacoder/heroku-buildpack-php-1,nsg/dokku-buildpack-picocms,pierredup/packager-buildpack-php,Jonatasmz/php-buildpack,penciu/apache,bobmaerten/dokku-buildpack-php,OKAMca/heroku-buildpack-php,Jonatasmz/php-buildpack,CHH/heroku-buildpack-php,bobmaerten/dokku-buildpack-php,stof/heroku-buildpack-php,jstacoder/heroku-buildpack-php-1,cachethq/cachet-buildpack,nsg/dokku-buildpack-picocms,ryosuzuki/php-buildpack