Merge pull request #1658 from commercetools/queue_docs

docs(queue): clarify usage of queue middleware

Author: jenschude

docs/sdk/README.md

@@ -23,7 +23,7 @@ If we take a step back and look at the general requirement, at the end we simply
 
 In this example (integration test) we are going to make some requests to the `/channels` API endpoint. For that we need to be able to make actual requests (`http` middleware) as well as to authenticate the requests using the API Client Credentials Flow (`auth` middleware).
 
-The `queue` middleware is not really necessary in this simple example but it is usually useful to limit a bit the number of concurrent requests.
+The `queue` middleware is not really necessary in this simple example but it is usually useful to limit a bit the number of concurrent requests and should be place before the `http` middleware.
 
 The `api-request-builder` package comes in handy to easily construct the request _URI_ but it is not really necessary as the _URI_ could be also typed manually.
 
@@ -54,7 +54,7 @@ const queueMiddleware = createQueueMiddleware({
   concurrency: 5,
 })
 const client = createClient({
-  middlewares: [authMiddleware, httpMiddleware, queueMiddleware],
+  middlewares: [authMiddleware, queueMiddleware, httpMiddleware],
 })
 
 describe('Channels', () => {