Coordinator-related decision point reference pages lack contextual descriptive text

[ahouseholder]

Is your feature request related to a problem? Please describe.

Most of our decision point pages have some text in addition to the bare decision point specification. This is useful to provide some context for what the decision point's intended use is. But the ones listed below have no such text.

Describe the solution you'd like

Add some text description to

https://certcc.github.io/SSVC/reference/decision_points/report_public/
https://certcc.github.io/SSVC/reference/decision_points/supplier_cardinality/
https://certcc.github.io/SSVC/reference/decision_points/supplier_contacted/
https://certcc.github.io/SSVC/reference/decision_points/supplier_engagement/
https://certcc.github.io/SSVC/reference/decision_points/supplier_involvement/

Potential exists to link to the example decision models they're used in (Coordinator trees), as well as linking to some Vultron pages where we actually show how these decision points fit into the CVD process model.

Describe alternatives you've considered

Status quo: These pages only show the decision point itself, but there's no explanation of what the decision point is representing.