[PATCHv2] vidioc-g-dv-timings.rst: document the v4l2_bt_timings reserved field

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This field was never documented, and neither was it mentioned that
it should be zeroed by the application.

Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
---
v1 of this patch was for the old DocBook documentation and was never merged,
so update the patch for the new sphinx documentation.
---
diff --git a/Documentation/media/uapi/v4l/vidioc-g-dv-timings.rst b/Documentation/media/uapi/v4l/vidioc-g-dv-timings.rst
index f7bf21f..955e5e9 100644
--- a/Documentation/media/uapi/v4l/vidioc-g-dv-timings.rst
+++ b/Documentation/media/uapi/v4l/vidioc-g-dv-timings.rst
@@ -219,6 +219,14 @@ EBUSY
        -  Several flags giving more information about the format. See
 	  :ref:`dv-bt-flags` for a description of the flags.

+    -  .. row 17
+
+       -  __u32
+
+       -  ``reserved[14]``
+
+       -  Reserved for future extensions. Drivers and applications must set
+          the array to zero.


 .. _v4l2-dv-timings:
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