Update facade docblocks

Author: taylorotwell

src/Illuminate/Support/Facades/Http.php

@@ -77,7 +77,7 @@
  * @method static \Illuminate\Http\Client\Response patch(string $url, array|\JsonSerializable|\Illuminate\Contracts\Support\Arrayable $data = [])
  * @method static \Illuminate\Http\Client\Response put(string $url, array|\JsonSerializable|\Illuminate\Contracts\Support\Arrayable $data = [])
  * @method static \Illuminate\Http\Client\Response delete(string $url, array|\JsonSerializable|\Illuminate\Contracts\Support\Arrayable $data = [])
- * @method static array pool(callable $callback)
+ * @method static array pool(callable $callback, int|null $concurrency = null)
  * @method static \Illuminate\Http\Client\Batch batch(callable $callback)
  * @method static \Illuminate\Http\Client\Response send(string $method, string $url, array $options = [])
  * @method static \GuzzleHttp\Client buildClient()