Outdated information in OpenStack security guide case studies

[Rahul U Nair]

Some of the case studies in OpenStack Security Guide needs review and outdated information needs to be updated.

case-studies/compliance-case-studies.rst
Line 39:
As we have openstack sensible security project now, it needs to be mentioned here https://docs.openstack.org/developer/openstack-ansible-security/ . And may be we can rewrite the sentence from `as there is no STIG` to `STIG guidelines can be deployed enforced using ansible-security`

case-studies/dashboard-case-studies.rst
Line 63:
nit: `;` at the end of server name
case-studies/instance-management-case-studies.rst

Line 19:
Intel Ivy Bridge and newer
Line 63:
May be we can write something like : "He plans to implement encrypted migrations by configuring the ``ACCESS_TYPE`` of ``live_migration_uri`` in /etc/libvirt/libvirtd.conf. " Please see this url for more details: /etc/libvirt/libvirtd.conf