add links to RIS and RV collectors

Author: digizeph

src/content/docs/radar/glossary.mdx

@@ -76,12 +76,14 @@ By default, the route visualization shows paths from the originating AS to [tier
 
 Above the visualization, a table details the prefix origin, including the originating AS, its visibility percentage across route collectors, and RPKI validation status (`valid`, `invalid`, `unknown`).
 
-Hovering over a link in the diagram reveals a tooltip with the connected ASNs, the observing BGP route collectors, and the last update timestamp.
+Hovering over a link in the diagram reveals a tooltip with the connected ASNs, the observing BGP route collectors (from [RIPE RIS][ris-collectors] and [RouteViews][route-views-collectors]), and the last update timestamp.
 
 [tier-1]: https://en.wikipedia.org/wiki/Tier_1_network
 [route-views]: https://www.routeviews.org/routeviews/
 [ripe-ris]: https://www.ripe.net/analyse/internet-measurements/routing-information-service-ris/
 [ris-live]: https://ris-live.ripe.net/
+[ris-collectors]: https://ris.ripe.net/docs/route-collectors/
+[route-views-collectors]: https://www.routeviews.org/routeviews/collectors/
 
 ## Certificates