kubeadm: update reference docs

- add section about working with phases under kubeadm-init.md
- update GA / beta status of features
- kubeadm alpha phase was moved to kubeadm init phase
- new commands were added under kubeadm alpha
- included new CoreDNS usage examples

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_all.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_apiserver-etcd-client.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_apiserver-kubelet-client.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_apiserver.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_etcd-healthcheck-client.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_etcd-peer.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_etcd-server.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_certs_renew_front-proxy-client.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubeconfig.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubeconfig_user.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubelet.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubelet_config.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubelet_config_download.md

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+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.

content/en/docs/reference/setup-tools/kubeadm/generated/kubeadm_alpha_kubelet_config_enable-dynamic.md

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+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.