Correct normal response codes for region docs
Correct normal response codes for region docs

The region documentation listed 20X http status codes as Error response codes.
This commit corrects the documentation to list 20X status codes as Normal
response codes.

Change-Id: Ia231a4c9a09d782746f3240da17b5814dbbdd270

mahak/keystone,ilay09/keystone,openstack/keystone,openstack/keystone,openstack/keystone,rajalokan/keystone,ilay09/keystone,cernops/keystone,rajalokan/keystone,cernops/keystone,mahak/keystone,ilay09/keystone,rajalokan/keystone,mahak/keystone