Include apache::mod::cluster::advertise_frequency in README
Include apache::mod::cluster::advertise_frequency in README

eputnam/puppetlabs-apache,yakatz/puppetlabs-apache,traylenator/puppetlabs-apache,puppetlabs/puppetlabs-apache,eputnam/puppetlabs-apache,yakatz/puppetlabs-apache,traylenator/puppetlabs-apache,puppetlabs/puppetlabs-apache