MAINTAINERS: update DMAengine documentation location

WIth ReST style documentation, we moved it to driver-api/dmaengine
so update this in MAINTAINERS entry

Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6671f37..eb04329 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4234,7 +4234,7 @@
 F:	drivers/dma/
 F:	include/linux/dmaengine.h
 F:	Documentation/devicetree/bindings/dma/
-F:	Documentation/dmaengine/
+F:	Documentation/driver-api/dmaengine/
 T:	git git://git.infradead.org/users/vkoul/slave-dma.git
 
 DMA MAPPING HELPERS