SPIGOT-4984: EnchantmentOffer.getCost() documentation is misleading

By: md_5 <git@md-5.net>

paper-api/src/main/java/org/bukkit/enchantments/EnchantmentOffer.java

@@ -60,8 +60,8 @@ public class EnchantmentOffer {
     }
 
     /**
-     * Gets the cost in experience levels the player has to pay to enchant his
-     * item with this enchantment.
+     * Gets the cost which is displayed as a number on the right hand side of
+     * the enchantment offer.
      *
      * @return cost for this enchantment
      */
@@ -70,8 +70,8 @@ public class EnchantmentOffer {
     }
 
     /**
-     * Sets the cost in experience levels the player has to pay to enchant his
-     * item with this enchantment
+     * Sets the the cost which is displayed as a number on the right hand side
+     * of the enchantment offer.
      *
      * @param cost cost for this enchantment
      */