Split documentation into two sections. More of this is needed here, but this is a start.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@334104 c90b9560-bf6c-de11-be94-00142212c4b1
Mention that entries without an equal sign are ignored. Recent feature request PHP Bug #67331 requests this functionality.

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@334105 c90b9560-bf6c-de11-be94-00142212c4b1