[media] media-types.rst: fix typo

Fix copy-and-paste error: the radio devices are /dev/radio, not /dev/vbi.

Signed-off-by: Hans Verkuil <<hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Documentation/media/uapi/mediactl/media-types.rst

@@ -413,7 +413,7 @@ Types and flags used to represent the media graph elements
 
        -  Device node interface for radio (V4L)
 
-       -  typically, /dev/vbi?
+       -  typically, /dev/radio?
 
     -  .. row 9