[11.x] Improve PHPDoc for mapSpread Method in Arr Class & Remove …

…Warning from IDE (#51952)

* feat: improve & fix ide warning in doc-block

* Update src/Illuminate/Collections/Arr.php

Co-authored-by: Caleb White <cdwhite3@pm.me>

* Update Arr.php

---------

Co-authored-by: Taylor Otwell <taylor@laravel.com>
Co-authored-by: Caleb White <cdwhite3@pm.me>

src/Illuminate/Collections/Arr.php

@@ -642,11 +642,12 @@ public static function mapWithKeys(array $array, callable $callback)
     /**
      * Run a map over each nested chunk of items.
      *
-     * @template TMapSpreadValue
+     * @template TKey
+     * @template TValue
      *
-     * @param  array  $array
-     * @param  callable(mixed...): TMapSpreadValue  $callback
-     * @return array<TKey, TMapSpreadValue>
+     * @param  array<TKey, array>  $array
+     * @param  callable(mixed...): TValue  $callback
+     * @return array<TKey, TValue>
      */
     public static function mapSpread(array $array, callable $callback)
     {