Update Javadoc

src/main/java/org/opentripplanner/routing/algorithm/filterchain/filters/system/OutsideSearchWindowFilter.java

@@ -7,7 +7,7 @@
 import org.opentripplanner.routing.algorithm.filterchain.framework.spi.RemoveItineraryFlagger;
 
 /**
- * This filter will remove all itineraries that are outside the search-window. In some
+ * This filter will remove all depart-at itineraries that are outside the search-window. In some
  * cases the access is time-shifted after the end of the search-window. These results
  * should appear again when paging to the next page. Hence, this filter will remove
  * such itineraries. The same is true for when paging to the previous page for arriveBy=true.