Added warnings about Event ext. peculiarities

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331229 c90b9560-bf6c-de11-be94-00142212c4b1
Del: unneeded 'undocumented' warnings

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331230 c90b9560-bf6c-de11-be94-00142212c4b1
Typo

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@331231 c90b9560-bf6c-de11-be94-00142212c4b1