add basic prop documentation

docs/usage.mdx

@@ -29,6 +29,8 @@ const results = await provider.search({ query: input.value });
 ## Using the leaflet control
 Or add the `GeoSearchControl` to the leaflet map instance, to render a search control on your map;
 
+See [Leaflet Control](/leaflet-control) for more info about the the options this control provides.
+
 <Playground>
     <Map provider="OpenStreetMap" />
 </Playground>