Move ABI documentation for custom shunt resistor attributes into the
generic iio documentation file. Exception for pac1934: leave it
untouched since it does not comply with common iio ABI generalization.
Signed-off-by: Matteo Martelli <matteomartelli3@gmail.com>
Link: https://patch.msgid.link/20240722-iio-pac1921-v3-2-05dc9916cb33@gmail.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>