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

Stop documenting vgonel() after its converting to the static function:
svn r147332 (by jeff): "Don't make vgonel() globally visible".
While here, specify the vnode locking scheme for vgone().

Discussed on: freebsd-hackers@
Approved by: kib (mentor)
MFC after: 10 days

Minor grammar fixup.

Catch up with the rename of symbol VDOOMED to VI_DOOMED in revision
1.198 of "sys/sys/vnode.h". Remove a cross-reference to a manual
page that never existed.

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Use 'manual page' instead of 'man page' for consistency.

Approved by: re (hrs)

Uniformly refer to a file system as "file system".

Approved by: re

mdoc(7) police: markup, grammar and spelling nits.

Reviewed by: davidc

Add manpages describing various vfs and vm APIs.

Submitted by: Chad David <davidc@acns.ab.ca>