- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

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

Document vholdl(9)
No longer refer to vbusy(9) or vfree(9)

o Document vdropl(9) [1].
o Add an MLINK for vdropl().

Reviewed by: des [1]
Obtained from: wording from vgone(9)

Fix two small grammar mistakes.

Approved by: das (mentor)

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

Approved by: re (hrs)

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>