Update method annotations in Sender class (#6634)

Author: huangdijia

src/Sender.php

@@ -27,8 +27,8 @@
 use function Hyperf\Engine\swoole_get_flags_from_frame;
 
 /**
- * @method push(int $fd, $data, int $opcode = null, $finish = null)
- * @method disconnect(int $fd, int $code = null, string $reason = null)
+ * @method void push(int $fd, $data, int $opcode = null, $finish = null)
+ * @method void disconnect(int $fd, int $code = null, string $reason = null)
  */
 class Sender
 {