MAINTAINERS: update DCO info

Drop the URL for DCO (URL is invalid).  Also, point to SubmittingPatches
for the current DCO.
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -44,9 +44,10 @@ trivial patch so apply some common sense.
 	or does something very odd once a month document it.
 
 	PLEASE remember that submissions must be made under the terms
-	of the OSDL certificate of contribution
-	(http://www.osdl.org/newsroom/press_releases/2004/2004_05_24_dco.html)
-	and should include a Signed-off-by: line.
+	of the OSDL certificate of contribution and should include a
+	Signed-off-by: line.  The current version of this "Developer's
+	Certificate of Origin" (DCO) is listed in the file
+	Documentation/SubmittingPatches.
 
 6.	Make sure you have the right to send any changes you make. If you
 	do changes at work you may find your employer owns the patch