Merge pull request #43443 from irfanurrehman/kubefed-doc-1

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
```

docs/admin/kubefed.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/admin/kubefed_init.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/admin/kubefed_join.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/admin/kubefed_options.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/admin/kubefed_unjoin.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.

docs/admin/kubefed_version.md

@@ -0,0 +1,3 @@
+This file is autogenerated, but we've stopped checking such files into the
+repository to reduce the need for rebases. Please run hack/generate-docs.sh to
+populate this file.