Update io(4) to match reality following revision 1.42 of sys/i386/i386/mem.c: only the super-user may open /dev/io regardless of the device permissions (just 4 years late!).
Update io(4) to match reality following revision 1.42 of
sys/i386/i386/mem.c: only the super-user may open /dev/io
regardless of the device permissions (just 4 years late!).

Also, add cross-reference to i386_{get,set}_ioperm(2).

PR:		kern/13359

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