Update map-config template comment

BlueMapCommon/src/main/resources/de/bluecolored/bluemap/config/maps/map.conf

@@ -68,7 +68,8 @@ cave-detection-uses-block-light: false
 
 # With the below values you can limit the map-render.
 # This can be used to ignore the nethers ceiling or render only a certain part of a world.
-# Changing this values might require a re-render of the map, already rendered tiles outside the limits will not be deleted.
+# If you change these value, bluemap automatically tries to update the map,
+# including deleting map-tiles which are outside the new limits.
 # Default is no min or max value (= infinite bounds)
 #min-x: -4000
 #max-x: 4000