media: docs: v4l2-controls: document file to include
The tutorial in this section is almost complete, add the one missing bit. Signed-off-by: NLuca Ceresoli <luca@lucaceresoli.net> Signed-off-by: NHans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: NMauro Carvalho Chehab <mchehab+samsung@kernel.org>
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