Doc Fix: remove mention of combined mode-related kernel parameters

Looks like you removed the combined_mode quirk (yay!) but didn't update
kernel-parameters.txt...  might confuse people.  Here's a patch to remove
mention of it from the documentation.
Signed-off-by: NJesse Barnes <jesse.barnes@intel.com>
Signed-off-by: NJeff Garzik <jeff@garzik.org>

Documentation/kernel-parameters.txt

@@ -754,14 +754,6 @@ and is between 256 and 4096 characters. It is defined in the file
 	inport.irq=	[HW] Inport (ATI XL and Microsoft) busmouse driver
 			Format: <irq>
 
-	combined_mode=	[HW] control which driver uses IDE ports in combined
-			mode: legacy IDE driver, libata, or both
-			(in the libata case, libata.atapi_enabled=1 may be
-			useful as well).  Note that using the ide or libata
-			options may affect your device naming (e.g. by
-			changing hdc to sdb).
-			Format: combined (default), ide, or libata
-
 	inttest=	[IA64]
 
 	io7=		[HW] IO7 for Marvel based alpha systems