doc-rst: intro: remove obsolete headers

The video, audio and OSD APIs are obsolete. V4L2 should be
used instead. So, remove them from this intro item.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-07-05 16:08:58 -03:00
commit ea02106611