refactor(app): Update the comments for the getInitialState function

- Replace the plugin documentation link with the official documentation link
- Optimize code formatting and remove unnecessary spaces

src/app.tsx

@@ -13,7 +13,7 @@ const isDev = process.env.NODE_ENV === 'development';
 const loginPath = '/user/login';
 
 /**
- * @see  https://umijs.org/zh-CN/plugins/plugin-initial-state
+ * @see https://umijs.org/docs/api/runtime-config#getinitialstate
  * */
 export async function getInitialState(): Promise<{
   settings?: Partial<LayoutSettings>;