[media] doc-rst: improve DTV_BANDWIDTH_HZ notes

There are several notes for this DTV property. Some are
outdated, so take some care of it, making it updated.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-07-10 09:48:58 -03:00
commit fed7b888f6