MFC r354812:

Update the ses(4) man page

This driver was largely rewritten in 2015 (svn r235911) but the man page was
never updated to match.

Reviewed by: trasz
Sponsored by: Axcient
Differential Revision: https://reviews.freebsd.org/D22339

MFC r342150:

Add a missing leading / in a filename.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Cross reference sesutil(8) and ses(4)

Submitted by: trasz
MFC after: 1 month (with r287473)

General mdoc(7) and typo fixes.

PR: 167776
Submitted by: Nobuyuki Koganemaru (kogane!jp.freebsd.org)
MFC after: 3 days

mdoc: drop redundant .Pp and .LP calls

They have no effect when coming in pairs, or before .Bl/.Bd

mdoc(7): Use the new feature of the .In macro.

Fixed double word typo.
MFC after: 7 days

mdoc(7) police: removed HISTORY info from the .Os call.

mdoc(7) police: normalize .Nd.

Prepare for mdoc(7)NG.

mdoc(7) police: use the new features of the Nm macro.

Update @freebsd.org email addresses to @FreeBSD.org as is the
precedent.

Fix a couple of typos and make the FILES section follow mdoc style.

Remove single-space hard sentence breaks. These degrade the quality
of the typeset output, tend to make diffs harder to read and provide
bad examples for new-comers to mdoc.

add a minimal man page for the SES driver