media: docs: vidioc-g-ext-ctrls.rst: Document p_s32 and p_s64 fields

p_s32 and p_s64 were added to the v4l2_ext_control struct, so these
should have documentation as well.
Signed-off-by: Daniel Lundberg Pedersen <dlp@qtec.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/userspace-api/media/v4l/vidioc-g-ext-ctrls.rst

@@ -185,6 +185,16 @@ still cause this situation.
       - ``p_u32``
       - A pointer to a matrix control of unsigned 32-bit values. Valid if
 	this control is of type ``V4L2_CTRL_TYPE_U32``.
+    * - __u32 *
+      - ``p_s32``
+      - A pointer to a matrix control of signed 32-bit values. Valid if
+        this control is of type ``V4L2_CTRL_TYPE_INTEGER`` and
+        ``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is set.
+    * - __u32 *
+      - ``p_s64``
+      - A pointer to a matrix control of signed 64-bit values. Valid if
+        this control is of type ``V4L2_CTRL_TYPE_INTEGER64`` and
+        ``V4L2_CTRL_FLAG_HAS_PAYLOAD`` is set.
     * - struct :c:type:`v4l2_area` *
       - ``p_area``
       - A pointer to a struct :c:type:`v4l2_area`. Valid if this control is