inout: use `doc_auto_cfg` (#1118) #1742

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	16s
test (1.81.0)	11s
build (1.81.0, wasm32-unknown-unknown)	21s
test (stable)	21s
build (stable, thumbv7em-none-eabi)	12s
build (stable, wasm32-unknown-unknown)	8s
minimal-versions / minimal-versions	18s
	1m 47s

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