fix a changelog entry

Bruce said he'd ignore it in English version.

zh_CN/chapter01/changelog.po

@@ -59,7 +59,7 @@ msgid ""
 "root;4718\">#4722</ulink>."
 msgstr ""
 "[bdubbs] — 更新到 iana-etc-20200821。修复 <ulink url=\"&lfs-ticket-"
-"root;4718\">#4722</ulink>。"
+"root;4722\">#4722</ulink>。"
 
 #. type: Content of: <sect1><itemizedlist><listitem><itemizedlist><para>
 msgid "2020-08-24"