Fix documentation for release-checklist

I still need to figure out the awsconfig problems.

Docker-DCO-1.1-Signed-off-by: Tibor Vass <teabee89@gmail.com> (github: tiborvass)
Not true, but even still wouldn't make sense to create a _new_ branch for.
Then it would just be something like "git checkout --track origin/release
|| git checkout release".