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Remove remaining uses of `doc(cfg(..))` (#616) #1097

Job	Run time
cross (1.72.0, aarch64-unknown-linux-gnu, default)	46s
cross (1.72.0, powerpc-unknown-linux-gnu, default)	36s
cross (stable, aarch64-unknown-linux-gnu, default)	36s
cross (stable, powerpc-unknown-linux-gnu, default)	44s
minimal-versions / minimal-versions	41s
set-msrv / set-msrv	2s
linux (x86_64-unknown-linux-gnu, 1.72.0)	37s
linux (x86_64-unknown-linux-gnu, stable)	32s
macos (1.72.0)	39s
build (1.72.0, thumbv7em-none-eabi)	19s
macos (stable)	26s
windows (x86_64-pc-windows-gnu, 1.72.0)	48s
build (1.72.0, wasm32-unknown-unknown)	21s
windows (x86_64-pc-windows-gnu, stable)	1m 21s
build (1.72.0, loongarch64-unknown-linux-gnu)	20s
build (stable, thumbv7em-none-eabi)	24s
build (stable, wasm32-unknown-unknown)	15s
build (stable, loongarch64-unknown-linux-gnu)	24s
	9m 51s

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