linux-wandboard

[media] doc-rst: move DVB avulse docs to Documentation/media

There are several documentation stuff under Documentation/dvb.

Move them to Documentation/media/dvb-drivers and rename them to
rst, as they'll soon be converted to rst files.

No changes at the documentation.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>