Fix spelling of parameter name in usage message
Fix spelling of parameter name in usage message

drolbr/Overpass-API,mmd-osm/Overpass-API,mmd-osm/Overpass-API,mmd-osm/Overpass-API,drolbr/Overpass-API,mmd-osm/Overpass-API,drolbr/Overpass-API,drolbr/Overpass-API,drolbr/Overpass-API,drolbr/Overpass-API