docs/zh_CN: remove zh-kernel.org in MAINTAINERS

This web site is on sale, and Li Yang said it won't be in service again.
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Weiwei Jia <harryxiyou@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

MAINTAINERS

@@ -3729,7 +3729,6 @@ F:	scripts/checkpatch.pl
 CHINESE DOCUMENTATION
 M:	Harry Wei <harryxiyou@gmail.com>
 L:	xiyoulinuxkernelgroup@googlegroups.com (subscribers-only)
-L:	linux-kernel@zh-kernel.org (moderated for non-subscribers)
 S:	Maintained
 F:	Documentation/translations/zh_CN/