- Improved TargetCardInASingleGraveyard to restrict all targets after the 1st to the same graveyard as the first chosen target

- Added slight documentation to Target and TargetCard
- Minor cleanup to Unlicensedhearse

Mage/src/main/java/mage/target/Target.java

@@ -36,6 +36,14 @@ public interface Target extends Serializable {
     // methods for targets
     boolean canChoose(UUID sourceControllerId, Ability source, Game game);
 
+    /**
+     * Returns a set of all possible targets that match the criteria of the implemented Target class.
+     *
+     * @param sourceControllerId    UUID of the ability's controller
+     * @param source                Ability which requires the targets
+     * @param game                  Current game
+     * @return                      Set of the UUIDs of possible targets
+     */
     Set<UUID> possibleTargets(UUID sourceControllerId, Ability source, Game game);
 
     boolean chooseTarget(Outcome outcome, UUID playerId, Ability source, Game game);