Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

mdoc: order prologue macros consistently by Dd/Dt/Os

Although groff_mdoc(7) gives another impression, this is the ordering
most widely used and also required by mdocml/mandoc.

Reviewed by: ru
Approved by: philip, ed (mentors)

Clarify the BUGS section.

Reported by: asmodai
Submitted by: jhb

mdoc(7) police: minor formatting/spelling fixes.

Man page for orm driver.

PR: 22078
Submitted by: Nikolai Saoukh <nms@otdel-1.org>