Document the new private_interface configuration setting.
Document the new private_interface configuration setting.

tumblr/jetpants,fgbreel/jetpants,dallasmarlow/jetpants,tumblr/jetpants,tumblr/jetpants,tumblr/jetpants,yonglehou/jetpants,yonglehou/jetpants,dallasmarlow/jetpants,fgbreel/jetpants