Fix gce_forwardingrule description
Fix gce_forwardingrule description

hunner/puppetlabs-gce_compute,icg-puppet/puppetlabs-gce_compute,puppetlabs/puppetlabs-gce_compute,ihmccreery/puppetlabs-gce_compute,puppetlabs/puppetlabs-gce_compute,ihmccreery/puppetlabs-gce_compute,hunner/puppetlabs-gce_compute,icg-puppet/puppetlabs-gce_compute