fix: createEncoder is used from the node, not from root import

Author: fryorcraken

docs/build/javascript/reliable-channels.md

@@ -50,8 +50,6 @@ When the `defaultBootstrap` parameter is set to `true`, your node will be bootst
 Choose a [content topic](/learn/concepts/content-topics) for your application and create a message `encoder` and `decoder`:
 
 ```js
-import { createEncoder, createDecoder } from "@waku/sdk";
-
 // Choose a content topic
 const ct = "/my-app/1/messages/proto";
 
@@ -195,4 +193,4 @@ reliableChannel.addEventListener("message-acknowledged", (event) => {
 
 :::tip Congratulations!
 You have successfully sent and received messages over the Waku Network using our reliable protocols such as Scalable Data Sync (SDS) and P2P Reliability.
-:::
+:::