Install Types in diskimage-builder

[Matt]

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:

- [X ] This doc is inaccurate in this way: there does not seem to be a nova element
- [ ] This is a doc addition request.
- [ ] I have a fix to the document that I can paste below including example: input and output.

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Release: 3.0.1.dev18 on 2015-11-13 18:45:28
SHA: dc6ad3a300f4b309e2eafeeeef89181a4cf97219
Source: https://opendev.org/openstack/diskimage-builder/src/doc/source/user_guide/install_types.rst
URL: https://docs.openstack.org/diskimage-builder/latest/user_guide/install_types.html