ref: a85c27af65ce9e831bcaf14da813dc24b495d376 drmdb/drmdoc d---------
drmdoc: update docs from upstream
drmdoc: stop accumulating content if indentation is missing

When indentation is missing, that means the docs for the prop are
finished. DRM docs often contain free-form paragraphs between prop docs.
drmdoc: sort props by name

This ensures the output order is deterministic.
drmdoc: use go/format to format generated files
drmdoc: new package