documentation: update s390 header file paths

Update Documentation/s390/ files to reflect changed header files
locations.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/Documentation/s390/s390dbf.txt b/Documentation/s390/s390dbf.txt
index e054209..2d10053 100644
--- a/Documentation/s390/s390dbf.txt
+++ b/Documentation/s390/s390dbf.txt
@@ -2,7 +2,7 @@
 ==================
 
 files: arch/s390/kernel/debug.c
-       include/asm-s390/debug.h
+       arch/s390/include/asm/debug.h
 
 Description:
 ------------