Looks good to me, but I'd recommend a review from James since he has been actually testing multi-arch in the lab.

The one last thing I had wanted to check was that removing the "inspection_enable_uefi = true" from undercloud.conf didn't affect the deploy.   Can confirm removing it has no effect, so we definitely can remove that from the documentation edits.   So the documentation changes look good.

Updated content available on the Customer Portal:

https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.2/html/director_installation_and_usage/assembly_installing-director-on-the-undercloud#assembly_configuring-the-cpu-architecture-for-the-overcloud

https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/16.2/html/director_installation_and_usage/assembly_installing-director-on-the-undercloud#proc_multiple-cpu-architecture-overcloud-images_overcloud-images