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

mdoc: drop redundant .Pp and .LP calls

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

A shorter version of the format string.

Scheduled mdoc(7) sweep.

Date business, update.

Follow the language currently used in the manual page.

Submitted by: Michal Mertl <mime@traveller.cz>

Wordsmith previous commit and bump document date.

Poked by: simon

Document recently added security.mac.portacl.autoport_exempt tunable.

Outraced the speed of doc request: trhodes

Mechanically kill hard sentence breaks and double whitespaces.

Assorted markup, spelling, and grammar fixes.

- Document more explicitly how the mac_portacl(4) policy works.
- Document all the policy sysctl's.
- Note that mac_portacl(4) appeared in FreeBSD 5.1.
- A bit of mdoc(7) fixes.

Much of the new text was inspired by the source code comments.

Reviewed by: rwatson

Assorted mdoc(7) fixes.

Approved by: re (blanket)

Document the new mac_portacl(4) policy.

Sponsored by: DARPA, Network Associates Laboratories
Obtained from: TrustedBSD Project