Quality: Finalise documentation of Persistency

To reach ML3 for Quality Management and Documentation Management we need to have at least one complete valid documentation. We want to archive this in Persistency by closing the following open topics:

- https://eclipse-score.github.io/persistency/main/docs/features/persistency/architecture/chklst_arc_inspection.html#doc__persistency_arc_inspection draft->valid
- https://eclipse-score.github.io/persistency/main/docs/manuals/security_manual.html#doc__persistency_security_manual draft->valid
- https://eclipse-score.github.io/persistency/main/score/kvs/docs/architecture/chklst_arc_inspection.html#doc__kvs_arc_inspection draft->valid
- https://eclipse-score.github.io/persistency/main/score/kvs/docs/detailed_design/index.html#doc__kvs_detailed_design draft->valid
- https://eclipse-score.github.io/persistency/main/score/kvs/docs/detailed_design/chklst_impl_inspection.html#doc__kvs_impl_inspection draft->valid

ML3 is planned for S-CORE milestone 0.9.