DOCS Stackube Architecture in Stackube

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [ ] This doc is inaccurate in this way: ______
- [ ] This is a doc addition request.
- [x] I have a fix to the document that I can paste below including example: input and output.

OpenStack Keytone >> OpenStack Keystone

If you have a troubleshooting or support issue, use the following resources:

 - Ask OpenStack: http://ask.openstack.org
 - The mailing list: http://lists.openstack.org
 - IRC: 'openstack' channel on Freenode

-----------------------------------
Release: on Oct 29, 2017
SHA: c853c272e0e0d42a8f0e8fe60d78478b413145af
Source: https://git.openstack.org/cgit/openstack/stackube/tree/doc/source/architecture.rst
URL: https://stackube.readthedocs.io/en/latest/architecture.html