[MEKO] K8s examples users omits useful superuser

Description

Customer in case 00694093 requests K8s example users updated with a super-user example in the manifest, such as

  roles:

    - db: admin

      name: clusterAdmin

    - db: admin

      name: readWriteAnyDatabase

    - db: admin

      name: dbAdminAnyDatabase

    - db: admin

      name: userAdminAnyDatabase

Customer asserted the k8s user examples given did not directly translate to their user use-case.

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)