feat: Update vue router docs for new option (#6413)

Author: mydea

src/platforms/javascript/guides/vue/configuration/integrations/vue-router.mdx

@@ -24,15 +24,7 @@ import Bar from "@/components/Bar";
 Vue.use(Router);
 
 const router = new Router({
-  routes: [
-    {
-      path: "/",
-      name: "HelloWorld",
-      component: HelloWorld,
-    },
-    { path: "/foo/:id", component: Foo },
-    { path: "/bar", component: Bar },
-  ],
+  // your router configuration
 });
 
 Sentry.init({
@@ -53,3 +45,19 @@ new Vue({
   template: "<App/>",
 });
 ```
+
+## Configuration
+
+You can pass an optional configuration object as second argument to the router instrumentation:
+
+```javascript
+vueRouterInstrumentation(vueRouter, { 
+  routeLabel: "path" 
+});
+```
+
+The available options are:
+
+| Key          | Type   | Default | Description                                                                                                                                                                                                                                              |
+| ------------ | ------ | ------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| routeLabel | string | `name`  | The label to use for the route transactions. Can be either `name` or `path`. When this is `name`, the transaction will use `route.name`, if it is set, and else use the path of the route. By setting this to `path` you can opt-out of this and always use the path. |