cleanup of geojson and route map code

app/Models/GeoJson.php

@@ -8,7 +8,12 @@ use \GeoJson\Feature\Feature;
 use \GeoJson\Feature\FeatureCollection;
 
 /**
- * Class GeoJson
+ * Return different points/features in GeoJSON format
+ * https://tools.ietf.org/html/rfc7946
+ *
+ * Once a PIREP is accepted, save this returned structure as a
+ * JSON-encoded string into the raw_data field of the PIREP row
+ *
  * @package App\Models
  */
 class GeoJson