zsh: update zsh completion for docker command

zsh completion is updated with the content of
felixr/docker-zsh-completion.

Docker-DCO-1.1-Signed-off-by: Vincent Bernat <vincent@bernat.im> (github: vincentbernat)
Merge pull request #7088 from vincentbernat/fix/zsh-completion-update

Update zsh completion for docker command with upstream (felixr/docker-zsh-completion) latest