media: dtv-demux.rst: minor markup improvements

Add a cross-reference to a mentioned structure and split
the kernel-doc stuff on a separate chapter.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-09-19 17:05:14 -04:00
commit 1607b8b574