docbook/deviceiobook: fixup x86 path/file names

Fix docbook templates for new x86 path/filenames:

docproc: linux-2.6.23-git2/include/asm-i386/io.h: No such file or directory
Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Documentation/DocBook/deviceiobook.tmpl

@@ -316,7 +316,7 @@ CPU B:  spin_unlock_irqrestore(&dev_lock, flags)
 
   <chapter id="pubfunctions">
      <title>Public Functions Provided</title>
-!Iinclude/asm-i386/io.h
+!Iinclude/asm-x86/io_32.h
 !Elib/iomap.c
   </chapter>