Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

MFC: r261447

Fix a typo.

MFC r232157, r232158:

r232157:
Fix various typos in manual pages.

Submitted by: amdmi3
PR: 165431

r232158:
Whitespace cleanup:
o Wrap sentences on to new lines
o Cleanup trailing whitespace

Merge r228040 from head to stable/9:

Cross-reference capsicum.4 from cap_enter.2 and cap_new.2.

Sponsored by: Google, Inc.

Approved by: re (kib)

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Make cap_new(2) and cap_getmode(2) symbols from libc public so applications
can link against them. Add man pages for the new system calls, with one
errant forward reference to changes not yet present in FreeBSD, but soon
will be.

Reviewed by: anderson
Obtained from: Capsicum Project
Sponsored by: Google, Inc.
Discussed with: benl, kris, pjd
MFC after: 3 months