Lab 3.1 Useless instructions

Hello,

After completing the LAB 3.1, I found that there is some useless instruction :

• The installation of the docker key (root@cp: ̃# curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -) We don't use the docker apt repo so we don't need this key
• The sudo with the last command is useless, I have the same results by running the command as a regular user (sudo kubeadm config print init-defaults)

Best regards,
Julien