doc-rst: extended-controls: use reference for VIDIOC_S_CTRL

Instead of using a constant, use references, just like the
other references for ioctl's.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2016-07-02 09:17:08 -03:00
commit 22c1cd2d79