add some comments

beego.go

@@ -42,10 +42,10 @@ var (
 	EnableGzip           bool   // enable gzip
 	DirectoryIndex       bool   //ebable DirectoryIndex default is false
 	EnbaleHotUpdate      bool   //enable HotUpdate default is false
-	HttpServerTimeOut    int64
-	ErrorsShow           bool
-	XSRFKEY              string
-	CopyRequestBody      bool
+	HttpServerTimeOut    int64  //set httpserver timeout
+	ErrorsShow           bool   //set weather show errors
+	XSRFKEY              string //set XSRF
+	CopyRequestBody      bool   //When in raw application, You want to the reqeustbody
 )
 
 func init() {