Show endpoints as purple circles rather than purple markers. Fixed a bug where editing polygons would not lead to an update

index.html

@@ -73,8 +73,8 @@
 		<h2>Instructions:</h2>
 		<p>
 			Click anywhere on the map to calculate where it is possible to freewheel from that point. A set of possible
-			end points will then appear on the map. The farthest possible end point is shown in red, while other possible
-			end points are shown in violet. Click an endpoint to see the calculated route that leads from the start point
+			end points will then appear on the map. The farthest possible end point is shown with a red marker, while other possible
+			end points are shown as purple circles. Click an endpoint to see the calculated route that leads from the start point
 			to the end point.
 		</p>
 		<p>