docs: Minor tweaks to DevStack guide
docs: Minor tweaks to DevStack guide

Fix indentation so code blocks don't appear as quotes, properly title
case case project names and format literals as such.

Change-Id: I3db0e83e30469d7217126f18dce813bf00abc0ae
Signed-off-by: Stephen Finucane <4725dc7f3632bf126d9fbdc30c347e91e8d2fe16@redhat.com>

openstack/barbican,openstack/barbican