docs(get-deis): update provision info

The comments were being wrapped due to our current CSS rules in our
code blocks, so I removed them. I also updated the documentation to
use the latest tagged release instead of pulling from master, as that
will prove to be more reliable as an example.

fixes deis/deis#1896
Do we want to have people check out a release tag? I thought we preferred everyone be on master until we've had a stable release.