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The sync from https://review.opendev.org/733244 updated to openstackdocstheme 2.2.1 and reno 3.1.0 versions. Set openstackdocs_pdf_link to link to PDF file. Note that the link to the published document only works on docs.openstack.org where the PDF file is placed in the top-level html directory. The site-preview places the PDF in a pdf directory. openstackdocstheme renames some variables, so follow the renames before the next release removes them. A couple of variables are also not needed anymore, remove them. See also http://lists.openstack.org/pipermail/openstack-discuss/2020-May/014971.html Change-Id: I0cc73a4e714f8b533b5c1381124141c3d07d47d1