media: doc: pixfmt-yuv: Fix V4L2-PIX-FMT-Y10P format

This packed grey-scale image format has a depth of 10 bits per pixel.
Every four consecutive pixels are packed into 5 bytes. Each of the first
4 bytes contain the 8 high order bits of the pixels, and the 5th byte
contains the 2 least significants bits of each pixel, in the same order.

The first two bytes are not corresponding to this description, fix it.

Fixes: af4f4505 ("media: doc: pixfmt-yuv: Move all luma-only YUV formats to common file")
Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/userspace-api/media/v4l/pixfmt-yuv-luma.rst

@@ -75,8 +75,8 @@ are often referred to as greyscale formats.
       - ``V4L2_PIX_FMT_Y10P``
       - 'Y10P'
 
-      - Y'\ :sub:`0`\ [7:0]
-      - Y'\ :sub:`1`\ [9:8]
+      - Y'\ :sub:`0`\ [9:2]
+      - Y'\ :sub:`1`\ [9:2]
       - Y'\ :sub:`2`\ [9:2]
       - Y'\ :sub:`3`\ [9:2]
       - Y'\ :sub:`3`\ [1:0] Y'\ :sub:`2`\ [1:0] Y'\ :sub:`1`\ [1:0] Y'\ :sub:`0`\ [1:0]