text: Title: Missing defaults and clarifying info for kube-controller-manager
  Body: **What happened**:
  
  In the KCM we're missing output about a few defaults, and probably a few of the options could use some clarity around `--allocate-node-cidrs` , `--cloud-controller-manager`, and i believe several other options have no `Default:` note, See 
  https://kubernetes.io/docs/reference/command-line-tools-reference/kube-controller-manager/  for details.
  
  **What you expected to happen**:
  
  All Options for the controller-manager have similar detail level with all `Default` values being  listed.
  
  **How to reproduce it (as minimally and precisely as possible)**:
  
  Browse https://kubernetes.io/docs/reference/command-line-tools-reference/kube-controller-manager/  or run `kube-controller-manager --help`
  
  **Anything else we need to know?**:
  
  See https://github.com/kubernetes/kubernetes/blob/master/cmd/controller-manager/app/options/kubecloudshared.go
  
  **Environment**:
  - Kubernetes version (use `kubectl version`): master
  