[media] DocBook/media: document the new RDS TX controls
[media] DocBook/media: document the new RDS TX controls

Document the new RDS features that will be supported by the si4713 driver.

Signed-off-by: Hans Verkuil <3a513708f73c27e7d36ebc496aa41dad6a3153ea@cisco.com>
Cc: Eduardo Valentin <19583d7f5a73f900a77b3924aabdcb631a4c7608@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <0cae1d1e981e84d16b82ca3d17be8a7f826608d3@samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs