Update link to example file

documentation/docs/start/get-geometry-example-file.md

 On linux:
 
 ```
-wget https://atlas-vp1.web.cern.ch/atlas-vp1/geometryfiles/geometry_atlas.db
+wget https://geomodel.web.cern.ch/examples/geometry_atlas.db 
 ```
 
 On mac:
 
 ```
-curl https://atlas-vp1.web.cern.ch/atlas-vp1/geometryfiles/geometry_atlas.db -o geometry_atlas.db
+curl https://geomodel.web.cern.ch/examples/geometry_atlas.db -o geometry_atlas.db
 ```