iio: adc: ti-ads131e08: Fix spelling mistake "tweek" -> "tweak"

There is a spelling mistake in variable tweek_offset and in comment
blocks. Fix these.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Andy Shevchenko <andy@kernel.org>
Link: https://patch.msgid.link/20250603165706.126031-1-colin.i.king@gmail.com


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