docs(command): update UseCommand javadoc for the combination form

Semesterprojekt/src/main/java/thb/jeanluc/adventure/command/impl/UseCommand.java

@@ -9,9 +9,10 @@ import java.util.List;
 import java.util.Optional;
 
 /**
- * Invokes the item-specific {@link Item#use(GameContext)} action. The
- * item must either be in the player's inventory or in the current room.
- * Usage: {@code use <item-id>}.
+ * With one argument, invokes the item-specific {@link Item#use(GameContext)}
+ * action; the item must be in the player's inventory or the current room.
+ * With two arguments ({@code use <item> on <item>}), delegates to the
+ * combination engine. Usage: {@code use <item>} or {@code use <item> on <item>}.
  */
 public class UseCommand implements Command {