remove docker_machine completion if it is no longer available on the system
update docker-completion evals to account for changing completions over time
NOTE:
Recent versions of Docker Desktop no longer include completions for
docker_machine which were previously symlinked to enable zsh completion
to function correctly. This update resolves the discrepancy.
NOTE:
Recent versions of Docker Desktop no longer include completions for docker_machine which were previously symlinked to enable zsh completion to function correctly. This update resolves the discrepancy.