Description of problem:
oc explain against openshift resources, several are missing details 

Version-Release number of selected component (if applicable):
4.3


How reproducible:
always.

Steps to Reproduce:
1. oc explain machine

You will see something like below:

`````
KIND:     Machine
VERSION:  machine.openshift.io/v1beta1

DESCRIPTION:
     <empty>
`````



Actual results:
oc explain not showing explanation

Expected results:
oc explain should show the explanation


Additional info:

The ask here is to have the various CRDs that we include in OpenShift documented so that using "oc explain" or viewing them in the Explore tab of the console shows the relevant information with regards to the schema. My understanding is that this is engineering's direction, all custom CRD's need to have documented schema.


for example, executing "oc explain machine" returns:

````````````````
KIND:     Machine
VERSION:  machine.openshift.io/v1beta1

DESCRIPTION:
     <empty>

```````````````

Whereas "oc explain oauth":

KIND:     OAuth
VERSION:  config.openshift.io/v1

DESCRIPTION:
     OAuth holds cluster-wide information about OAuth. The canonical name is
     `cluster`. It is used to configure the integrated OAuth server. This
     configuration is only honored when the top level Authentication config has
     type set to IntegratedOAuth.

FIELDS:
...

-- Attaching the file to the bug which includes all such resource which needs the #oc explain attention.