* gnu/packages/crates-io.scm: Fix copyright line for Zheng Junjie.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
;;; Copyright © 2020 Arun Isaac <arunisaac@systemreboot.net>
;;; Copyright © 2020 Antoine Côté <antoine.cote@posteo.net>
;;; Copyright © 2021 aecepoglu <aecepoglu@fastmail.fm>
-;;; Copyright @ 2021 Zheng Junjie <873216071@qq.com>
+;;; Copyright © 2021 Zheng Junjie <873216071@qq.com>
;;; Copyright © 2021 Alexandru-Sergiu Marton <brown121407@posteo.ro>
;;;
;;; This file is part of GNU Guix.