[zh-cn]sync kubeadm_init_phase_upload-certs kubeadm_join_phase_control-plane-prepare_all

Signed-off-by: xin.li <xin.li@daocloud.io>

content/zh-cn/docs/reference/setup-tools/kubeadm/generated/kubeadm_init_phase_upload-certs.md

@@ -36,9 +36,11 @@ kubeadm init phase upload-certs [flags]
 <td></td><td style="line-height: 130%; word-wrap: break-word;">
 <!--
 Key used to encrypt the control-plane certificates in the kubeadm-certs Secret.
+The certificate key is a hex encoded string that is an AES key of size 32 bytes.
 -->
 <p>
 用于加密 kubeadm-certs Secret 中的控制平面证书的密钥。
+证书密钥是十六进制编码的字符串，是大小为 32 字节的 AES 密钥。
 </p>
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content/zh-cn/docs/reference/setup-tools/kubeadm/generated/kubeadm_join_phase_control-plane-prepare_all.md

@@ -69,9 +69,11 @@ If the node should host a new control plane instance, the port for the API Serve
 <td></td><td style="line-height: 130%; word-wrap: break-word;">
 <!--
 Use this key to decrypt the certificate secrets uploaded by init.
+The certificate key is a hex encoded string that is an AES key of size 32 bytes.
 -->
 <p>
 使用此密钥解密由 init 上传的证书 Secret。
+证书密钥是十六进制编码的字符串，是大小为 32 字节的 AES 密钥。
 </p>
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