[doc] Issue in "Custom folder" - Clarification/modification?

[peteingithub]

Custom folder:

https://documentation.suse.com/suse-edge/3.1/html/edge/atip-management-cluster.html#mgmt-cluster-custom-folder

"metal3.sh: contains the configuration for the Metal3 component to be used (no modifications needed). In future versions, this script will be replaced to use instead Rancher Turtles to make it easy."