* Clarify what a built-in type is.
* Add PHP 8 equivalent of ReflectionParameter::isArray().
* Leave note on ReflectionParameter::getClass() for what to use instead.
* Clarify order of the array in getParameters().
* Add example to aid working with union types.
* Add updated equivalent of isCallable().
still using this, after discussion on the phpdoc list.
From now on, manual.ced will need to be found at ~/.phpdoc/manual.ced.
git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@288721 c90b9560-bf6c-de11-be94-00142212c4b1