Fix the missing font for Chinese characters in <keycap>.

Author: xuxinhang

zh/guide/fop.xconf.in

@@ -32,11 +32,12 @@
         -->
         <font kerning="yes" embed-url="opentype/source/SourceHanSerifCN-Regular.otf">
           <font-triplet name="serif" style="normal" weight="normal"/>
-          <font-triplet name="monospace" style="normal" weight="normal"/>
         </font>
         <font kerning="yes" embed-url="truetype/Arphic/ukai.ttc" sub-font="AR PL UKai CN">
           <font-triplet name="serif" style="italic" weight="normal"/>
           <font-triplet name="serif" style="italic" weight="bold"/>
+          <font-triplet name="monospace" style="normal" weight="normal"/>
+          <font-triplet name="monospace" style="italic" weight="normal"/>
         </font>
         <font kerning="yes" embed-url="opentype/source/SourceHanSerifCN-Bold.otf">
           <font-triplet name="serif" style="normal" weight="bold"/>