Description of problem:

Documentation on layered images is not clear. The following section contains possible errors:

Using on-cluster layering to apply a custom layered image

The example used here does not work. This because the base image does not have a /etc/yum.repos.d and thus rpm-ostree install <something> does not work. 

Also the docs mention that:

• You have the push secret that the MCO needs to push the new custom layered image to your registry.

• You have a pull secret that your nodes need to pull the new custom layered image from your registry. This should be a different secret than the one used to push the image to the repository.

But in the example yaml file both secrets refrenced are the same.