Update Docker.md
Update Docker.md

Added a space before the line break to eliminate the error:

FATA[0000] Error: failed to remove one or more containers 
tackittj@sal:/$ docker run -d --name="sal" \
> -p 80:8000 \
> --link postgr
erikng/sal,chasetb/sal,salopensource/sal,sheagcraig/sal,salopensource/sal,erikng/sal,chasetb/sal,erikng/sal,sheagcraig/sal,erikng/sal,chasetb/sal,sheagcraig/sal,salopensource/sal,sheagcraig/sal,salopensource/sal,chasetb/sal