Documentation/kernel-parameters: Remove obsolete ip2=

The handling of ip2= in drivers/char/ip2/ip2base.c was moved to
drivers/char/ip2/ip2main.c in commit
47babd4c ("Char: merge ip2main and
ip2base").

The ip2 driver was demoted to staging in commit
4a6514e6 ("tty: move obsolete and broken
tty drivers to drivers/staging/tty/"), and finally deleted in commit
51c9d654 ("Staging: delete tty drivers").
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/kernel-parameters.txt

@@ -1416,10 +1416,6 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 	ip=		[IP_PNP]
 			See Documentation/filesystems/nfs/nfsroot.txt.
 
-	ip2=		[HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
-			See comment before ip2_setup() in
-			drivers/char/ip2/ip2base.c.
-
 	irqfixup	[HW]
 			When an interrupt is not handled search all handlers
 			for it. Intended to get systems with badly broken