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glance configuration options in docs

I am installing and configuring glance in a CentOS 7 VM, following the official guide http://docs.openstack.org/liberty/install-guide-rdo/glance-install.html. It suggests the following configuration in /etc/glance/glance-api.conf:

[keystone_authtoken]
...
auth_uri = http://controller:5000
auth_url = http://controller:35357
project_domain_id = default
user_domain_id = default
project_name = service

The auth_uri/auth_url pattern looks rather bizarre to me. Thus I referred to the configuration reference, and it has identity_uri instead. Do they function in the same way? auth_url is described as a registry configuration option, in the DEFAULT section, which should be in /etc/glance/glance-registry.conf I suppose? Furthermore, there are admin_user, admin_password, admin_tenant_name etc., but username, password, project_domain_id and others are not found in the reference. Which document is correct, or both are? Why?