MAINTAINERS: exceptions for Documentation maintainer

Note that I don't maintain Documentation/ABI/,
Documentation/devicetree/, or the language translation files.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -2917,6 +2917,9 @@ L:	linux-doc@vger.kernel.org
 T:	quilt http://www.infradead.org/~rdunlap/Doc/patches/
 S:	Maintained
 F:	Documentation/
+X:	Documentation/ABI/
+X:	Documentation/devicetree/
+X:	Documentation/[a-z][a-z]_[A-Z][A-Z]/
 
 DOUBLETALK DRIVER
 M:	"James R. Van Zandt" <jrv@vanzandt.mv.com>