improve routing algorithm docs

docs/Features/DeveloperFeatures/Preferences/preferences.md

@@ -27,12 +27,12 @@ You can configure three different routing algorithms:
 - [BidirectionalAStar](mgmap-install://mg4gh.github.io/MGMapViewer/Features/MainTrackFeatures/Routing/routing_bidirectionalastar.zip) (AStar with search in both directions, delivers optimal result)
 - [BidirectionalAStarFNO](mgmap-install://mg4gh.github.io/MGMapViewer/Features/MainTrackFeatures/Routing/routing_bidirectionalastarfno.zip) (AStar with search in both directions, faster, but may deliver none optimal result)
 
-
+For BidirectionalAStar it looks like this:
 ```
-FSSearch.reverseSearchOn=Boolean:true
-FSSearch.locationBasedSearchOn=Boolean:true
+#FSRouting.RoutingAlgorithm=AStar
+FSRouting.RoutingAlgorithm=BidirectionalAStar
+#FSRouting.RoutingAlgorithm=BidirectionalAStarFNO
 ```
-From the device you can use this link create this configuration: 
-[geocode.zip](mgmap-install://mg4gh.github.io/MGMapViewer/Features/FurtherFeatures/Geocode/geocode.zip)
+
 
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