- 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

Typo and mdoc(7) style fixes.

PR: 168117
Submitted by: Nobuyuki Koganemaru (kogane&jp!freebsd!org)
MFC after: 3 days

Fix mdoc(7) markup.

Remove trailing whitespace per mdoc lint warning

Disussed with: gavin
No objection from: doc
Approved by: joel
MFC after: 3 days

- Add support for software pre-scaling of ISOCHRONOUS transfers.

MFC after: 14 days
Approved by: thompsa (mentor)

Spelling fixes.

mdoc: consistently spell our email addresses <foo@FreeBSD.org>

Reviewed by: ru

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)

Removed duplicate usbd_xfer_state(9) link.

Move programming info from usb(4) to usbdi(9) and update for the usb stack
changeover. Needs much more content still.

Spelling fixes.

Add basic documentation for many of the kernel USB functions that
USB device drivers use to talk to USB devices. This is probably
still a bit rough and it does not yet include the functions specific
to HID, ethernet, hubs, host controller drivers, task threads or
debugging.