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

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

Sort sections.

Markup fixes.

Fixed the .Os call (missing or wrong).

Mechanically kill hard sentence breaks and double whitespaces.

'options atm' should actually read 'device atm'.

Pointed out by: Craig Rodrigues

This is a driver for Fore PCA200E cards that uses busdma and works on
little endian and big endian and with 32 and 64 bit pointers. It already
has the hooks to be used for HARP, NATM and ngATM.