docs: Update README.md configure pubsub as a service module (#1802)

Co-authored-by: Chad Nehemiah <chad.nehemiah94@gmail.com>

Author: 2 people

examples/pubsub/README.md

@@ -36,8 +36,10 @@ const createNode = async () => {
     transports: [tcp()],
     streamMuxers: [yamux(), mplex()],
     connectionEncryption: [noise()],
-	  // we add the Pubsub module we want
-	  pubsub: gossipsub({ allowPublishToZeroPeers: true })
+    services: {
+      // we add the Pubsub module we want
+      pubsub: gossipsub({ allowPublishToZeroPeers: true })
+    }
   })
 
   return node