Train Series Release Notes in cinderlib

[Adam Proctor]

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.
- [ ] I have a fix to the document that I can paste below including example: input and output.

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 - Ask OpenStack: http://ask.openstack.org
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Release: on 2020-03-21 13:25:49
SHA: 3db2b2a85455f958da12e9f484467ba11afc2853
Source: https://opendev.org/openstack/cinderlib/src/releasenotes/source/train.rst
URL: https://docs.openstack.org/releasenotes/cinderlib/train.html