[docs] Correct alignment for code block
[docs] Correct alignment for code block

Currently the code-block shows up as a blockquote.

Change-Id: Iba4eac08d19fd403e204692c868a49b7e45ac38f
Closes-Bug: #1629976

cfarquhar/openstack-ansible,bunchc/openstack-ansible,openstack/openstack-ansible,cloudnull/os-ansible-deployment,os-cloud/os-ansible-deployment,weezer/openstack-ansible,BjoernT/os-ansible-deployment,BjoernT/openstack-ansible,BjoernT/os-ansible-deployment,Logan2211/openstack-ansible,os-cloud/os-ansible-deployment,Logan2211/openstack-ansible,BjoernT/openstack-ansible,cloudnull/os-ansible-deployment,cfarquhar/openstack-ansible,bunchc/openstack-ansible,openstack/openstack-ansible,robb-romans/openstack-ansible,robb-romans/openstack-ansible,stackforge/os-ansible-deployment,yanyao/openstack-ansible,stackforge/os-ansible-deployment,weezer/openstack-ansible,yanyao/openstack-ansible,BjoernT/os-ansible-deployment