zend server how to find my web server document root directory on Mac OS X

Here ->  http://files.zend.com/help/Zend-Server/zend-server.htm#mac_installing_zend_server.htm%3FTocPath%3DZend%2520Server%2520Installation%2520Guide|Mac%2520OS%2520X%2520Installation%2520and%2520Upgrade|_____1

Explains that a default installation of Zend installs at 

usr/local/zend/apache2/htdocs/