Doc: update 00-INDEX files to reflect the runnable code move

Update 00-INDEX files with the current file list to reflect the runnable
code move.

Acked-by: Michal Marek <mmarek@suse.com>
Acked-by: Jonathan Corbet <corbet@lwn.net>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
diff --git a/Documentation/00-INDEX b/Documentation/00-INDEX
index cb9a6c6..3acc4f1 100644
--- a/Documentation/00-INDEX
+++ b/Documentation/00-INDEX
@@ -46,7 +46,8 @@
 Intel-IOMMU.txt
 	- basic info on the Intel IOMMU virtualization support.
 Makefile
-	- some files in Documentation dir are actually sample code to build
+	- This file does nothing. Removing it breaks make htmldocs and
+	  make distclean.
 ManagementStyle
 	- how to (attempt to) manage kernel hackers.
 RCU/