chapter06: Missed translation in diffutils page

chapter06/diffutils.xml

@@ -66,7 +66,7 @@
       <segtitle>安装的程序</segtitle>
 
       <seglistitem>
-        <seg>cmp, diff, diff3, and sdiff</seg>
+        <seg>cmp, diff, diff3, 以及 sdiff</seg>
       </seglistitem>
     </segmentedlist>