Add PHPDoc type

Author: zonuexe

stubs/BackedEnum.stub

@@ -3,11 +3,13 @@
 interface BackedEnum extends UnitEnum
 {
 	/**
+	 * @return static
 	 * @pure
 	 */
 	public static function from(int|string $value): static;
 
 	/**
+	 * @return ?static
 	 * @pure
 	 */
 	public static function tryFrom(int|string $value): ?static;