Update the Vault administration documentation for adding Kubernetes clusters
Update the Vault administration documentation for adding Kubernetes clusters, the cluster infos secrets are now terraformed under a different path whenever possible.
See also:
- https://ops.gitlab.net/gitlab-com/gl-infra/config-mgmt/-/merge_requests/8316
- https://ops.gitlab.net/gitlab-com/gl-infra/config-mgmt/-/merge_requests/8322
Part of gitlab-com/gl-infra/production-engineering#25111 (closed)
Edited by Pierre Guinoiseau