staging:iio:light: Move tsl2x7x ABI docs to correct location.

These seem to be up to date but never moved out of staging when the driver
did. Hence let us move them out now.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Brian Masney <masneyb@onstation.org>
Cc: Brian Masney <masneyb@onstation.org>
Link: https://lore.kernel.org/r/20200905174721.216452-3-jic23@kernel.org

diff --git a/drivers/staging/iio/Documentation/light/sysfs-bus-iio-light-tsl2x7x b/Documentation/ABI/testing/sysfs-bus-iio-light-tsl2772
similarity index 100%
rename from drivers/staging/iio/Documentation/light/sysfs-bus-iio-light-tsl2x7x
rename to Documentation/ABI/testing/sysfs-bus-iio-light-tsl2772