update docu USAGE.md

docs/USAGE.md

@@ -33,11 +33,10 @@ For a list of all supported arguments, run:
 - `python wahoo_map_creator.py cli -h`
 
 #### Main arguments
-**Create maps for countries**
+**Create maps for a country**
 - `python wahoo_map_creator.py cli -co <country>`
 
 **Create maps for X/Y coordinates**
-
 In particular for testing adjustments in configuration-files or coding it is helpful to create maps for only one/some tiles!
 
 To create maps for only one tile and not a whole country, one can use the X/Y coordinates of that tile. X/Y coordinates can be retrieved from this in zoom-level 8: [link](http://tools.geofabrik.de/map/#8/50.3079/8.8026&type=Geofabrik_Standard&grid=1).