x86: Fix help message for STRICT_DEVMEM config option

The message talked about "left on" when it meant to say disabled.
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

arch/x86/Kconfig.debug

@@ -8,7 +8,7 @@ source "lib/Kconfig.debug"
 config STRICT_DEVMEM
 	bool "Filter access to /dev/mem"
 	help
-	  If this option is left on, you allow userspace (root) access to all
+	  If this option is disabled, you allow userspace (root) access to all
 	  of memory, including kernel and userspace memory. Accidental
 	  access to this is obviously disastrous, but specific access can
 	  be used by people debugging the kernel. Note that with PAT support