iio: adc: fix typos found by codespell

Fix various spelling mistakes in comments and error messages across drivers/iio/adc/, found by running codespell. Signed-off-by: Giorgi Tchankvetadze <giorgitchankvetadze1997@gmail.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>


Author Giorgi Tchankvetadze Committer Jonathan Cameron Date Commit Parent d6bd0e27