Loïc Molinari authored Feb 21, 2024 and Pekka Paalanen committed Feb 22, 2024

Add a section about the headless backend to the main Weston manual
page and describe the current CLI options as well the new
`--refresh-rate` one.

Fix the incorrect list of supported transforms in the CLI usage.

Signed-off-by: Loïc Molinari <loic.molinari@collabora.com>