Hass.io, recover config files from cli

login to get out of hassio cli and into bash
docker ps to get a list of containers
note the first 3 characters or so of the container for homeassistant - for me it was 51a
docker exec -it 51a /bin/bash
ls to make sure configuration.yaml is there
vi configuration.yaml to edit the file
edit your mistake
esc + :wq to save and exit
exit then login to get back to hassio CLI
homeassistant check to make sure the conf is right this time
homeassistant restart