reboot parameter in Documentation/kernel-parameters.txt

Documentation fix for the arm and arm26 architectures,
in which the reboot kernel parameter is set in arch/*/kernel/process.c
Signed-off-by: Michael Opdenacker <michael@free-electrons.com>
Signed-off-by: Adrian Bunk <bunk@stusta.de>

Documentation/kernel-parameters.txt

@@ -1368,7 +1368,7 @@ and is between 256 and 4096 characters. It is defined in the file
 
 	reboot=		[BUGS=IA-32,BUGS=ARM,BUGS=IA-64] Rebooting mode
 			Format: <reboot_mode>[,<reboot_mode2>[,...]]
-			See arch/*/kernel/reboot.c.
+			See arch/*/kernel/reboot.c or arch/*/kernel/process.c			
 
 	reserve=	[KNL,BUGS] Force the kernel to ignore some iomem area