inout: use `doc_auto_cfg` (#1118) #1732

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	18s
test (1.81.0)	15s
build (1.81.0, wasm32-unknown-unknown)	18s
test (stable)	22s
build (stable, thumbv7em-none-eabi)	16s
build (stable, wasm32-unknown-unknown)	11s
minimal-versions / minimal-versions	23s
	2m 3s

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