Documentation: Remove references to dead "noasync" kernel parm

Signed-off-by: Robert P. J. Day <rpjday@mindspring.com>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Adrian Bunk <bunk@kernel.org>

Documentation/kernel-parameters.txt

@@ -1133,9 +1133,6 @@ and is between 256 and 4096 characters. It is defined in the file
 	noapic		[SMP,APIC] Tells the kernel to not make use of any
 			IOAPICs that may be present in the system.
 
-	noasync		[HW,M68K] Disables async and sync negotiation for
-			all devices.
-
 	nobats		[PPC] Do not use BATs for mapping kernel lowmem
 			on "Classic" PPC cores.
 

Documentation/m68k/kernel-options.txt

@@ -890,10 +890,7 @@ Syntax: nosync:0
 5.5.2) noasync
 --------------
 
-Syntax: noasync:0
-
-  Disables async and sync negotiation for all devices.  Any value
-  after the colon is acceptable (and has the same effect).
+[OBSOLETE, REMOVED]
 
 5.5.3) nodisconnect
 -------------------