Add style for table footer row
The table footer row is currently styled as a regular table row. See https://github.com/graphitefriction/asciidoctor/blob/new-docs/docs/asciidoc/modules/tables/pages/add-footer-row.adoc for usecases/testing.
The table footer row is currently styled as a regular table row. See https://github.com/graphitefriction/asciidoctor/blob/new-docs/docs/asciidoc/modules/tables/pages/add-footer-row.adoc for usecases/testing.