Adding link to related resources.

Author: Oxyjun

src/content/docs/durable-objects/best-practices/websockets.mdx

@@ -383,4 +383,5 @@ If you are using older versions, note that while hibernatable WebSocket events s
 
 - [Mozilla Developer Network's (MDN) documentation on the WebSocket class](https://developer.mozilla.org/en-US/docs/Web/API/WebSocket)
 - [Cloudflare's WebSocket template for building applications on Workers using WebSockets](https://github.com/cloudflare/websocket-template)
-- [Methods of Durable Object base class](/durable-objects/api/base/)
+- [Durable Object base class](/durable-objects/api/base/)
+- [Durable Object State interface](/durable-objects/api/state/)