zh_CN: missed translation of man-db configuration option

chapter06/man-db.xml

@@ -70,9 +70,9 @@
       <varlistentry revision="systemd">
         <term><command>sed -i '/find/s@/usr@@' init/systemd/man-db.service.in</command></term>
         <listitem>
-          <para>This changes a harcoded path to the <command>find</command>
-          utility, which we install in
-          <filename class="directory">/bin</filename>.</para>
+          <para>修改硬编码的，指向 <command>find</command>
+          工具的路径，它被我们安装到
+          <filename class="directory">/bin</filename> 目录。</para>
         </listitem>
       </varlistentry>