iio: adc: ti-ads1018: Drop stale kernel-doc function context
The driver no longer uses iio_device_claim_buffer_mode(). Drop it from
ads1018_spi_read_exclusive() context remark.
Signed-off-by: Kurt Borja <kuurtb@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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