Removing https from docker registry docs

Change-Id: Ia68effa45677ae3cd2d7dfa99db888f27b2fd599
diff --git a/prereqs/docker-registry.md b/prereqs/docker-registry.md
index a94587e..cce78ee 100644
--- a/prereqs/docker-registry.md
+++ b/prereqs/docker-registry.md
@@ -27,7 +27,7 @@
 The registry can be queried at any time, for example:
 
 ```shell
-curl -X GET https://KUBERNETES_IP:30500/v2/_catalog
+curl -X GET http://KUBERNETES_IP:30500/v2/_catalog
 ```
 
 {% include "/partials/push-images-to-registry.md" %}