iio: dac: Fix converters spelling typo.

Correct the converters typo error

"convertors" => "converters"

Signed-off-by: Karan Sanghavi <karansanghvi98@gmail.com>
Link: https://patch.msgid.link/20241111-dackconfigcodespell-v1-1-2498567be34c@gmail.com


Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>