Refactor autoscale docs
What does this MR do?
Refactor autoscale docs, getting ready for documenting https://gitlab.com/gitlab-org/gitlab-ce/issues/39650
Closes #2883 (closed), #2994 (closed)
Edited by Achilleas Pipinellis
Refactor autoscale docs, getting ready for documenting https://gitlab.com/gitlab-org/gitlab-ce/issues/39650
Closes #2883 (closed), #2994 (closed)