fix minor issues with router.jade.

public/docs/ts/latest/guide/router.jade

@@ -1408,6 +1408,9 @@ figure.image-display
   :marked
     Keep the Routing Module file in the same folder as its companion module file.
     Here both `heroes-routing.module.ts` and `heroes.module.ts` are in the same `app/heroes` folder.
+    
+    将路由模块文件放到它相关的模块文件所在目录里。
+    这里，`heroes-routing.module.ts`和`heroes.module.ts`都在`app/heroes`目录中。
 
 :marked
   We use the same techniques we learned in creating the `app-routing.module.ts`.
@@ -2550,12 +2553,10 @@ h3#import-crisis-module 把危机中心模块导入`AppModule`的路由中
 
 a#redirect
 
-h3#redirect Redirecting routes
-
-h3#redirect 重定向路由
-
 :marked
   ### Redirecting routes
+  
+  ### 重定向路由
 
   When the application launches, the initial URL in the browser bar is something like: