Add documentation about CPU and Memory being shown on the cluster list
Problem to solve
The purpose of this issue is to investigate if there's need to add docs related to this change. If it's needed, we should define where to add it and what to add it.
Relates to this issue: #207031 (closed)
Relates to this RP: gitlab-com/www-gitlab-com!52711
This is what the new CPU and Memory columns look like: