media: dvb: point to the location of the old README.dvb-usb file

This file got renamed, but the references still point to the
old place.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/drivers/media/usb/dvb-usb/af9005-remote.c b/drivers/media/usb/dvb-usb/af9005-remote.c
index 9b29ffa..f7cdcc8 100644
--- a/drivers/media/usb/dvb-usb/af9005-remote.c
+++ b/drivers/media/usb/dvb-usb/af9005-remote.c
@@ -17,7 +17,7 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
- * see Documentation/dvb/README.dvb-usb for more information
+ * see Documentation/media/dvb-drivers/dvb-usb.rst for more information
  */
 #include "af9005.h"
 /* debug */