doc: Switch to asciidoctor to format docs asciidoc and a2x are no longer actively maintained and Debian policy encourages people to move away from them to asciidoctor. Signed-off-by: Keith Packard <keithp@keithp.com>
Doc updates for version 1.8.4 Signed-off-by: Keith Packard <keithp@keithp.com>