Modernize private property declarations in src/item

src/item/enchantment/EnchantmentInstance.php

@@ -29,21 +29,10 @@ namespace pocketmine\item\enchantment;
  * Note: This class is assumed to be immutable. Consider this before making alterations.
  */
 final class EnchantmentInstance{
-	/** @var Enchantment */
-	private $enchantment;
-	/** @var int */
-	private $level;
-
-	/**
-	 * EnchantmentInstance constructor.
-	 *
-	 * @param Enchantment $enchantment Enchantment type
-	 * @param int         $level Level of enchantment
-	 */
-	public function __construct(Enchantment $enchantment, int $level = 1){
-		$this->enchantment = $enchantment;
-		$this->level = $level;
-	}
+	public function __construct(
+		private Enchantment $enchantment,
+		private int $level = 1
+	){}
 
 	/**
 	 * Returns the type of this enchantment.