inout: use `doc_auto_cfg` (#1118) #716

Job	Run time
build (1.60.0, armv7a-none-eabi)	50s
build (1.60.0, thumbv7em-none-eabi)	48s
build (1.60.0, wasm32-unknown-unknown)	52s
build (stable, armv7a-none-eabi)	14s
cross (aarch64-unknown-linux-gnu, 1.60.0)	1m 21s
build (stable, thumbv7em-none-eabi)	18s
build (stable, wasm32-unknown-unknown)	12s
cross (aarch64-unknown-linux-gnu, stable)	30s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.60.0, sudo apt update && sudo apt install gcc-mult...	1m 4s
x86 (x86_64-unknown-linux-gnu, 1.72.0)	24s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	26s
cross (powerpc-unknown-linux-gnu, 1.60.0)	1m 12s
x86 (x86_64-unknown-linux-gnu, stable)	13s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.60.0)	49s
cross (powerpc-unknown-linux-gnu, stable)	31s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	9s
test (x86_64-apple-darwin, macos-latest, 1.60.0)	1m 3s
test (x86_64-apple-darwin, macos-latest, stable)	14s
test (x86_64-pc-windows-msvc, windows-latest, 1.60.0)	29s
test (x86_64-pc-windows-msvc, windows-latest, stable)	1m 31s
minimal-versions / minimal-versions	1m 31s
	14m 41s

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