代理帮助文档增加文件名

src/main/resources/sql/20190130/help_document.sql

@@ -144,7 +144,7 @@ is automatically deleted from the cache by the cache manager, regardless
 of whether or not it has expired.
 
 ', null);
-INSERT INTO `help_document` VALUES ('2', 'Control Policy
+INSERT INTO `help_document` VALUES ('2', 'control_policy.md', 'Control Policy
 
 On National Proxy System, Individual Control policy rules determine
 whether to allow, block, redirect or replace a session based on traffic