docs(gateways): explicit mention serializer interceptor

Author: mukaschultze

content/websockets/gateways.md

@@ -128,7 +128,7 @@ handleEvent(data) {
 
 > info **Hint** The `WsResponse` interface is imported from `@nestjs/websockets` package.
 
-> warning **Warning** You should return a class instance that `implements WsResponse` if your `data` field relies on Nest's serialization, as it ignores plain JavaScript objects responses.
+> warning **Warning** You should return a class instance that `implements WsResponse` if your `data` field relies on `ClassSerializerInterceptor`, as it ignores plain JavaScript objects responses.
 
 In order to listen for the incoming response(s), the client has to apply another event listener.