Small fixes to README.md

iot/README.md

@@ -7,30 +7,30 @@ Cloud IoT Core platform.
 
 ## Quickstart
 
-1.  Install the Google Cloud SDK as described in [the device manager guide](https://cloud.google.com/iot/docs/device_manager_guide#install_the_gcloud_cli).
+1.  Install the Google Cloud SDK as described in [the Cloud IoT Core documentation](https://cloud.google.com/iot/docs/how-tos/getting-started#set_up_the_google_cloud_sdk_and_gcloud).
 1.  Create a Cloud Pub/Sub topic:
 
     gcloud beta pubsub topics create projects/my-iot-project/topics/device-events
 
-1.  Add the service account `cloud-iot@system.gserviceaccount.com` to that
+1.  Add the service account `cloud-iot@system.gserviceaccount.com` with the role `Publisher` to that
     Cloud Pub/Sub topic from the [Cloud Developer Console](https://console.cloud.google.com)
     or by setting the `GOOGLE_CLOUD_PROJECT` environment variable and using the
     helper script in the `scripts/` folder.
 
 1.  Create a registry:
 
-        gcloud alpha iot registries create my-registry \
+        gcloud beta iot registries create my-registry \
             --project=my-iot-project \
             --region=us-central1 \
-            --pubsub-topic=projects/my-iot-project/topics/device-events
+            --event-pubsub-topic=projects/my-iot-project/topics/device-events
 
 1.  Use the `generate_keys.sh` script to generate your signing keys:
 
         ./scripts/generate_keys.sh
 
 1.  Create a device.
 
-        gcloud alpha iot devices create my-node-device \
+        gcloud beta iot devices create my-node-device \
             --project=my-iot-project \
             --region=us-central1 \
             --registry=my-registry \