Update DragonSlayer.java

Typo - fix `abiltiy` to `ability`.

src/main/java/com/questhelper/helpers/quests/dragonslayer/DragonSlayer.java

@@ -533,7 +533,7 @@ public List<ExperienceReward> getExperienceRewards()
 	public List<UnlockReward> getUnlockRewards()
 	{
 		return Arrays.asList(
-				new UnlockReward("The abiltiy to equip a Green D'hide Body, Rune Platebody & Dragon Platebody"),
+				new UnlockReward("The ability to equip a Green D'hide Body, Rune Platebody & Dragon Platebody"),
 				new UnlockReward("Access to Crandor"),
 				new UnlockReward("Access to the Corsair Cove Resource Area."),
 				new UnlockReward("Ability to receive dragons as a slayer task."));