media: docs: v4l2-controls: remove repeated ioctl names

Mentioning :ref:`VIDIOC_QUERYCTRL` renders all the three related ioctls.
Explicitly adding VIDIOC_QUERY_EXT_CTRL and VIDIOC_QUERYMENU will make
them render twice, so remove them

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>