In installation instructions for Docker on Ubuntu, adding GPG key causes junk to be output to terminal

[dcottinghamiqg]

Suggest that the second command in step 4 is amended to:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/docker.gpg > /dev/null

(No difference in the end result: just visually less scary.)