Clean up configuration documentataion on v2 user CRUD
Clean up configuration documentataion on v2 user CRUD

Now that this is no longer an extension, we should remove
the description on how to modify the paste pipeline for it.

Change-Id: I3b9e9338da2a114bb02d27370f3930bf65a8d7a6

openstack/keystone,mahak/keystone,ilay09/keystone,rajalokan/keystone,mahak/keystone,dims/keystone,rajalokan/keystone,klmitch/keystone,openstack/keystone,mahak/keystone,ilay09/keystone,dims/keystone,ilay09/keystone,cernops/keystone,openstack/keystone,cernops/keystone,himanshu-setia/keystone,rajalokan/keystone,klmitch/keystone,himanshu-setia/keystone