docs(zh): translate the last paragraph of named_routes to Chinese (#2141

)

* translate the last paragraph of named routes docs

* docs(zh): translate last paragraph of named-routes to Chinese

*  translate the last paragraph of `named-routes` in `zh`

* Apply suggestions from code review

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Co-authored-by: quanzhi <qf37@duke.edu>
Co-authored-by: Jinjiang <zhaojinjiang@me.com>

packages/docs/zh/guide/essentials/named-routes.md

@@ -40,6 +40,4 @@ router.push({ name: 'user', params: { username: 'erina' } })
 
 完整的例子在[这里](https://github.com/vuejs/vue-router/blob/dev/examples/named-routes/app.js).
 
-<!-- TODO: translation -->
-
-Each name **must be unique** across all routes. If you add the same name to multiple routes, the router will only keep the last one. You can read more about this [in the Dynamic Routing](../advanced/dynamic-routing.md#Removing-routes) section.
+所有路由的命名**都必须是唯一的**。如果为多条路由添加相同的命名，路由器只会保留最后那一条。你可以在[动态路由](../advanced/dynamic-routing.md#Removing-routes)章节了解更多。