When deprecating, the alternative should be provided.

src/main/java/org/bukkit/block/MobSpawner.java

@@ -7,7 +7,7 @@ import org.bukkit.entity.MobType;
  * 
  * @author sk89q
  * 
- * @deprecated
+ * @deprecated Use CreatureSpawner instead.
  */
 public interface MobSpawner extends BlockState {
     /**

src/main/java/org/bukkit/event/player/PlayerEggThrowEvent.java

@@ -84,7 +84,7 @@ public class PlayerEggThrowEvent extends PlayerEvent {
      *
      * @param hatchType The type of the mob being hatched by the egg
      * 
-     * @deprecated
+     * @deprecated Use setHatchType(CreatureType hatchType) instead.
      */
     public void setHatchType(MobType hatchType) {
         this.hatchType = CreatureType.fromName(hatchType.getName());