Tidy validation failed mirror/sponsors

I received Tidy validation failed mail.

At
https://lists.debian.org/debian-www/2020/11/msg00047.html
Paul Wise says
I think this issue got fixed since then.
But I don't think. How can I solve it?


---------- Forwarded message ---------
보낸사람: Debian Webmaster <[email protected]>
Date: 2020년 11월 22일 (일) 오전 12:50
Subject: Tidy validation failed

*** /srv/www.debian.org/www/mirror/sponsors.ko.html
line 1593 column 10 - Error: <khc> is not recognized!
line 1593 column 10 - Warning: discarding unexpected <khc>

--
 You received this mail for the language code ko.
 Please edit webwml/english/devel/website/validation.data if this is not
accurate.
 Please also update webwml/english/devel/website/ with the new
coordinator(s) data.