fix Loader::register docblock

flight/core/Loader.php

@@ -48,10 +48,9 @@ class Loader
      * Registers a class.
      *
      * @param string $name Registry name
-     * @param class-string<T>|Closure(): T $class Class name or function to instantiate class
+     * @param class-string<T>|(Closure(): T) $class Class name or function to instantiate class
      * @param array<int, mixed> $params Class initialization parameters
-     * @param ?Closure(T $instance): void $callback $callback Function to call after object instantiation
-     *
+     * @param null|(Closure(T $instance): void) $callback $callback Function to call after object instantiation
      * @template T of object
      */
     public function register(string $name, $class, array $params = [], ?callable $callback = null): void