Using docker load instead of docker import

docs/getting-started-guides/scratch.md

@@ -195,8 +195,9 @@ You have several choices for Kubernetes images:
   - Useful if you are using a private registry.
   - The release contains files such as `./kubernetes/server/bin/kube-apiserver.tar` which
     can be converted into docker images using a command like
-    `tar -C kube-apiserver -c . | docker import - kube-apiserver`
-  - *TODO*: test above command.
+    `docker load -i kube-apiserver.tar`
+  - You can verify if the image is loaded successfully with the right reposity and tag using
+    command like `docker images`
 
 For etcd, you can:
 - Use images hosted on Google Container Registry (GCR), such as `gcr.io/google_containers/etcd:2.0.12`