docs: update content

docs/src/docPages/examples/collaborative-editing.md

@@ -1,16 +1,25 @@
 # Collaborative editing
 
+:::pro Commercial use
+Using the collaborative editing commercially? [Become a sponsor](/sponsor) to fund its development!
+:::
+
+## toc
+
+## Introduction
 This example shows how you can use tiptap to let multiple users collaborate in the same document in real-time.
 
 It connects all clients to a WebSocket server and merges changes to the document with the power of [Y.js](https://github.com/yjs/yjs). If you want to learn more about collaborative text editing, check out [our guide on collaborative editing](/guide/collaborative-editing).
 
+## Example
 :::warning Shared Document
 Be nice! The content of this editor is shared with other users from the Internet.
 :::
 
 <demo name="Examples/CollaborativeEditing" />
 
-In case you’re wondering what kind of sorcery you need on the server to achieve this, here is the backend code for the demo:
+## Backend
+In case you’re wondering what kind of sorcery you need on the server to achieve this, here is the whole backend code for the demo:
 
 ```js
 import { Server } from '@hocuspocus/server'