Copy stable/11@r303970 to releng/11.0 as part of the 11.0-RELEASE
cycle.

Prune svn:mergeinfo from the new branch, and rename it to RC1.

Update __FreeBSD_version.

Use the quarterly branch for the default FreeBSD.conf pkg(8) repo and
the dvd1.iso packages population.

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

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: 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)

- sched_4bsd is no longer a default system scheduler on some
architectures, so call it "traditional" instead.

- sched_ule is no longer buggy or experimental (according to
rev. 1.7 of sched_ule(4)), so don't call it experimental
(reported by a user on stable@).

Reviewed by: rwatson

sched_core(4) removed.

Add a manpage for the CORE scheduler.

(Mostly) markup fixes.

Approved by: re (blanket)

Fix small spelling error.

Approved by: brueffer (mentor)

Add rudimentary man pages for kernel options sched_4bsd and sched_ule,
which document some of the sysctls available for configuring 4bsd, some
of the bullet features of ule, and that ule is considered experimental
still.

MFC after: 3 days