[docs] Updates content for clarity
[docs] Updates content for clarity

Change-Id: I514400d1535191f24c8569596407eb9787427084
Partial-bug: #1652769

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