Add descriptions for empty namespaces

[gewarren]

Describe the issue or suggestion

• Add descriptions to empty namespace (ns-*.xml) files
• Add descriptions to member groups

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.

I couldn't figure out the best area label to add to this issue. If you have write-permissions please help me learn by adding exactly one area label.