fix comment in stackhpc-overcloud-dib.yml

following review

Co-authored-by: Alex Welsh <[email protected]>

Author: elelaysh

etc/kayobe/stackhpc-overcloud-dib.yml

@@ -63,9 +63,7 @@ stackhpc_overcloud_dib_env_vars_ark:
     --build-arg=ROCKY_USE_CUSTOM_DNF_MIRRORS=true
     --build-arg=ROCKY_CUSTOM_DNF_MIRROR_URLS={{ [stackhpc_repo_rocky_9_baseos_url, stackhpc_repo_rocky_9_appstream_url] | join(',') }}
   DIB_DISTRIBUTION_MIRROR: "{{ stackhpc_repo_ubuntu_noble_url if os_distribution == 'ubuntu' else '' }}"
-  # DIB_ROCKY_CONTAINER_STACKHPC_RESTORE_UPSTREAM_REPOFILES=true is important for
-  # the multinode workflow, where we need to install packages (tmux) in cloudinit
-  # or deploy-openstack-config.yml: /etc/yum.repos.d is empty in the built image.
+  # Ensure upstream repofiles are re-enabled after image build, otherwise `yum.repos.d` is left empty
   DIB_ROCKY_CONTAINER_STACKHPC_RESTORE_UPSTREAM_REPOFILES: true
 
 # StackHPC overcloud DIB image packages.