Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

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

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

mdoc: drop redundant .Pp calls, kill EOL whitespace

Allow multiple makeoption lines to be used with the += operator, this permits
the following syntax in the kernel config.

makeoptions MODULES_OVERRIDE=foo
makeoptions MODULES_OVERRIDE+=bar
makeoptions MODULES_OVERRIDE+=baz

Bump config minor version to 600007.

Document multiple hints lines.
Tweak machine description to more accurately reflect second argument being
the cpu architecture. Note correspondence with MACHINE and MACHINE_ARCH.

Document the two argument form of the "machine" directive.

Reviewed by: imp
MFC After: 3 days

config.5 was repocopied from share/man/man5/ to usr.sbin/config/.

Repocopied by: peter

Document "makeoption", "nocpu", and "nomakeoptions" directives.
(Indeed this should be repo-copied to src/usr.sbin/config/.)

Fully document (no)?(device|option)s?.

This page should probably be repocopied to src/usr.sbin/config/.

Assorted markup, spelling, and grammar fixes.

Document the "files" directive.

Reminded by: jmg

Eliminate non-existent word.

Submitted by: jwd

"towards" -> "toward". According to dictionary.com, the use of "towards"
is common in British English, while "toward" is the preferred form in
American English. Use the American form for consistency.

Correct the date on the manual page.

Submitted by: Tom Rhodes <trhodes@freebsd.org>,
underway@comcast.net (Gary W. Swearingen)

New section 5 manual page detailing our kernel configuration file
format.

Reviewed by: Ruslan Ermilov <ru@freebsd.org>, Jens
Schweikhardt <schweikh@schweikhardt.net>