Improve comparison description. Add example

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@332116 c90b9560-bf6c-de11-be94-00142212c4b1
Update built-in web server description

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@332117 c90b9560-bf6c-de11-be94-00142212c4b1