sha3

Remove remaining uses of `doc(cfg(..))` (#616) #1180

Job	Run time
minimal-versions / minimal-versions	2m 53s
set-msrv / set-msrv	2s
test (1.71.0)	3m 29s
build (1.71.0, thumbv7em-none-eabi)	26s
test (stable)	3m 14s
build (1.71.0, wasm32-unknown-unknown)	19s
cross (1.71.0, aarch64-unknown-linux-gnu, default)	1m 9s
build (stable, thumbv7em-none-eabi)	12s
cross (1.71.0, powerpc-unknown-linux-gnu, default)	1m 17s
build (stable, wasm32-unknown-unknown)	12s
cross (stable, aarch64-unknown-linux-gnu, default)	1m 1s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 17s
	15m 31s

Provide feedback