Documentation: media: Fix v4l2_ctrl_vp8_frame struct

Description and control were out of sync.
Signed-off-by: Fritz Koenig <frkoenig@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Documentation/userspace-api/media/v4l/ext-ctrls-codec-stateless.rst

@@ -971,8 +971,8 @@ FWHT Flags
       - ``horizontal_scale``
       - Horizontal scaling factor.
     * - __u8
-      - ``vertical_scaling factor``
-      - Vertical scale.
+      - ``vertical_scale``
+      - Vertical scaling factor.
     * - __u8
       - ``version``
       - Bitstream version.