message: docs(feed2): update usage
diff: @@ -49,14 +49,13 @@ npm i -D vuepress-plugin-feed2@next
  ```ts
  // .vuepress/config.ts
  +import { feed } from "vuepress-plugin-feed2";
  +
  export default {
  plugins: [
  - [
  - "@mr-hope/feed",
  - {
  + feed({
  // your options
  - },
  - ],
  + }),
  ],
  };
  ```
  @@ -67,14 +66,13 @@ export default {
  ```js
  // .vuepress/config.js
  +const { feed } = require("vuepress-plugin-feed2");
  +
  module.exports = {
  plugins: [
  - [
  - "@mr-hope/feed",
  - {
  + feed({
  // your options
  - },
  - ],
  + }),
  ],
  };
  ```
  