Remove remaining uses of `doc(cfg(..))` #1096

Job	Run time
cross (1.72.0, aarch64-unknown-linux-gnu, default)	51s
cross (1.72.0, powerpc-unknown-linux-gnu, default)	37s
cross (stable, aarch64-unknown-linux-gnu, default)	30s
cross (stable, powerpc-unknown-linux-gnu, default)	43s
minimal-versions / minimal-versions	36s
set-msrv / set-msrv	3s
build (1.72.0, thumbv7em-none-eabi)	20s
build (1.72.0, wasm32-unknown-unknown)	18s
build (1.72.0, loongarch64-unknown-linux-gnu)	23s
linux (x86_64-unknown-linux-gnu, 1.72.0)	37s
build (stable, thumbv7em-none-eabi)	17s
linux (x86_64-unknown-linux-gnu, stable)	29s
build (stable, wasm32-unknown-unknown)	24s
build (stable, loongarch64-unknown-linux-gnu)	17s
macos (1.72.0)	29s
windows (x86_64-pc-windows-gnu, 1.72.0)	46s
windows (x86_64-pc-windows-gnu, stable)	1m 7s
macos (stable)	23s
	9m 10s

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