help text: SOFTWARE_SUSPEND doesn't need ACPI

The note that SOFTWARE_SUSPEND doesn't need APM is helpful, but nowadays
the information that it doesn't need ACPI, too, is even more helpful.
Signed-off-by: Adrian Bunk <bunk@stusta.de>

kernel/power/Kconfig

@@ -41,7 +41,7 @@ config SOFTWARE_SUSPEND
 	depends on PM && SWAP && (X86 && (!SMP || SUSPEND_SMP)) || ((FRV || PPC32) && !SMP)
 	---help---
 	  Enable the possibility of suspending the machine.
-	  It doesn't need APM.
+	  It doesn't need ACPI or APM.
 	  You may suspend your machine by 'swsusp' or 'shutdown -z <time>' 
 	  (patch for sysvinit needed).