docs: 📝 update docs

packages/docs/src/entry.preview.tsx

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+/*
+ * WHAT IS THIS FILE?
+ *
+ * It's the bundle entry point for `npm run preview`.
+ * That is, serving your app built in production mode.
+ *
+ * Feel free to modify this file, but don't remove it!
+ *
+ * Learn more about Vite's preview command:
+ * - https://vitejs.dev/config/preview-options.html#preview-options
+ *
+ */
+import { createQwikCity } from '@builder.io/qwik-city/middleware/node'
+import render from './entry.ssr'
+import qwikCityPlan from '@qwik-city-plan'
+
+/**
+ * The default export is the QwikCity adaptor used by Vite preview.
+ */
+export default createQwikCity({ render, qwikCityPlan })