Add more cn domains (#3388)

* alibaba: add wdjimg.com

* xunlei: add more domains

* category-ai-cn: add more domains

* category-documents-cn: add 51wendang.com

* category-entertainment-cn: add yxdown.com

* category-games-cn: add feihuo.com

* category-media-cn: add more domains

* geolocation-cn: add 51ctocdn.cn

and reorder

data/category-documents-cn

@@ -1,5 +1,6 @@
 1ppt.com
 360doc.com
+51wendang.com
 52ppt.com
 badou.com
 book118.com