Automatic merge from submit-queue (batch tested with PRs 43443, 46193, 49071, 47252)

[Federation][Kubefed] Support reference document autogeneration for kubefed

This PR is needed to address the documentation issue https://github.com/kubernetes/kubernetes.github.io/issues/2888

Apart from the code auto generation have updated some descriptions for consistency.

**Special notes for your reviewer**:
@kubernetes/sig-federation-misc 
cc @madhusudancs @csbell  

**Release note**:

```NONE
```