Fix footnote reference to Aodh in docs
Fix footnote reference to Aodh in docs

Change-Id: I97734655aad20efd1372b5fa157b9b2c5c9cce12

openstack/ceilometer,idegtiarov/ceilometer,ityaptin/ceilometer,openstack/ceilometer,ityaptin/ceilometer,idegtiarov/ceilometer