[Federation][Kubefed] Add placeholders for generated docs

docs/.generated_docs

@@ -5,6 +5,12 @@ docs/admin/kube-apiserver.md
 docs/admin/kube-controller-manager.md
 docs/admin/kube-proxy.md
 docs/admin/kube-scheduler.md
+docs/admin/kubefed.md
+docs/admin/kubefed_init.md
+docs/admin/kubefed_join.md
+docs/admin/kubefed_options.md
+docs/admin/kubefed_unjoin.md
+docs/admin/kubefed_version.md
 docs/admin/kubelet.md
 docs/man/man1/kube-apiserver.1
 docs/man/man1/kube-controller-manager.1

docs/admin/kubefed.md

+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

+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

+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

+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

+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

+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.