1) Use the new c99 initialization in the pci driver example. Also,
don't claim this device is a tty.
2) Add notes about caution needed during detach routine wrt interrupts
and locking.
3) Add note that vtophys is deprecated and to use busdma instead.
Since the busdma API isn't completely settled for 5.x yet,
don't document it. I'll leave that to others when the API is
done being frobbed.
* Use ftp.hostname.com/directory rather than
ftp.hostname.com:directory.
* s/freebsd.org/FreeBSD.org/
* Use relative links for FreeBSD.org documents
PR: 31447
Submitted by: Cyrille Lefevre
Found by: linbot