Category of "Unknown" institutions in TOBI dashboard is unclear

[dederkej]

Describe what you'd like. Mockups or screenshots are encouraged.

I would like to suggest to explain the "Unknown" category in the tab "Findability" at https://eth-library.github.io/naif/dashboards/tobi/

What type of change is this?

Enhancement

Any links or references we should review?

https://eth-library.github.io/naif/dashboards/tobi/