libcamera: bayer_format: Expand documentation

The current documentation of the BayerFormat::transform() function
reports examples on the Bayer components ordering transformation for
horizontal flip (mirroring) but not for vertical flip or for the
combination of the two.

It is useful to complete the documentation to ease understanding of the
transform() function on a sensor's Bayer pattern.

Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: David Plowman <david.plowman@raspberrypi.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

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