CS2: add additional setting info (#1551)

Author: Greelan

counter-strike2config.json

@@ -145,7 +145,7 @@
         "DisplayName": "Map Group",
         "Category": "Counter-Strike 2:stadia_controller",
         "Subcategory": "Server:dns:1",
-        "Description": "Sets the map group to load to enable map rotation. Alternatively specify a Workshop Collection ID which includes the maps required for rotation",
+        "Description": "Sets the map group to load to enable map rotation. The map group must be defined in 'game/csgo/gamemodes_server.text'. See [example](https://github.com/kus/cs2-modded-server/blob/master/game/csgo/gamemodes_server.txt). Alternatively specify a Workshop Collection ID which includes the maps required for rotation",
         "Keywords": "map,group,mapgroup",
         "FieldName": "mapgroup",
         "InputType": "text",