message: Fix legacy client fetcher example code
diff: @@ -152,7 +152,7 @@ const subscriptionUrl = 'wss://myschema.com/graphql';
  const fetcher = createGraphiQLFetcher({
  url,
  - legacyWsClient: new SubscriptionsClient(subscriptionUrl),
  + legacyWsClient: new SubscriptionClient(subscriptionUrl),
  });
  export const App = () => <GraphiQL fetcher={fetcher} />;
  