docs/zh_TW: remove the mailing list entry for zh_TW

Due to some reasons the current mailing list will be revoked and new one
will replace it in the future, hence remove the entry from MAINTAINERS
ahead of time.

Signed-off-by: Hu Haowen <src.res.211@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20230720141846.1787-1-src.res.211@gmail.com

Author: srcres258

MAINTAINERS

@@ -21620,7 +21620,6 @@ F:	kernel/trace/trace_sched_wakeup.c
 
 TRADITIONAL CHINESE DOCUMENTATION
 M:	Hu Haowen <src.res.211@gmail.com>
-L:	linux-doc-tw-discuss@lists.sourceforge.net (moderated for non-subscribers)
 S:	Maintained
 W:	https://github.com/srcres258/linux-doc
 T:	git git://github.com/srcres258/linux-doc.git doc-zh-tw