Add group level delete api to packages

What does this MR do?

As we worked through #227714 (closed) we learned that we do in fact have a group delete API for Packages. This MR intends to update the docs accordingly.

Open questions

• When was this feature introduced?

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• Documentation (if required)
• Merge request performance guidelines
• Style guides