Modified the AD405x Documentation #250

Job	Run time
lint	38s
check-versions	1m 53s
build (ad2s1210_iio)	2m 7s
build (ad405x_iio)	2m 21s
build (ad4130_iio)	2m 18s
build (ad559xr_console)	2m 11s
build (ad5754r_iio)	2m 5s
build (ad5770r_console)	2m 3s
build (ad579x_iio)	1m 57s
build (ad590_console)	2m 3s
build (ad5933_console)	2m 5s
build (ad7124_console)	2m 12s
build (ad7124_temperature-measure)	2m 5s
build (ad7134_iio)	2m 13s
build (ad717x_console)	2m 28s
build (ad717x_iio)	2m 20s
build (ad719x_iio)	2m 22s
build (ad7689_iio)	2m 14s
build (ad77681_iio)	2m 1s
build (ad777x_iio)	2m 12s
build (adt7420_console)	2m 5s
build (evb_discovery_firmware)	2m 3s
build (ltc2672_iio)	1m 58s
build (ltc268x_console)	2m 12s
build (nanodac_console)	2m 8s
	52m 14s

Provide feedback