Documentation/zorro.txt: Update path to arch-specific header files

  - Arch-specific headers were moved to arch/<arch/>/include/asm,
  - APUS support was dropped a long time ago

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

Documentation/zorro.txt

@@ -95,7 +95,7 @@ The treatment of these regions depends on the type of Zorro space:
 -------------
 
 linux/include/linux/zorro.h
-linux/include/asm-{m68k,ppc}/zorro.h
+linux/arch/m68k/include/asm/zorro.h
 linux/include/linux/zorro_ids.h
 linux/drivers/zorro
 /proc/bus/zorro