Update docs/architecture/overview.md

Co-authored-by: Yohan Boniface <[email protected]>

docs/architecture/overview.md

@@ -4,7 +4,7 @@ uMap is a server and a client. The server is build with the Django framework, an
 
 Basically, here is how it works:
 
-- Most of the data is stored as [geoJSON files](https://datatracker.ietf.org/doc/html/rfc7946), on the server.
+- Most of the data is stored as [geoJSON files](https://geojson.org/), on the server.
 - Some other parts of the data is stored in the database (users, permissions, etc)
 - PostGIS is used for some of its geo features, but for the most part, the computation is done on the frontend with Leaflet.