Howard Chu writes:
Zytrax.com is not a reliable source of OpenLDAP documentation. Most of what they advise is misguided or flat wrong.
Yet Google(OpenLDAP cn=config)'s two first hits are at Zytrax. It's not surprising people keep using that stuff.
Maybe the OpenLDAP site could be improved to help that. Google has some guidelines for that at http://www.google.com/webmasters/.