OVN information in networking-ovn

[vinaya]

provided url http://www.openvswitch.org/support/dist-docs/ovn-architecture.7.html is giving the error 404

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: _provided url is not found_____
- [ ] 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: on 2018-03-02 10:14:41
SHA: eda5d7f80d877601170631c5f5485370ea701f42
Source: https://opendev.org/openstack/networking-ovn/src/doc/source/admin/ovn.rst
URL: https://docs.openstack.org/networking-ovn/latest/admin/ovn.html