Remove remaining uses of `doc(cfg(..))` #1198

Job	Run time
riscv32-zknh	1m 24s
riscv64-zknh	1m 34s
minimal-versions / minimal-versions	41s
set-msrv / set-msrv	3s
build (1.79.0, thumbv7em-none-eabi)	20s
build (1.79.0, wasm32-unknown-unknown)	27s
linux (i686-unknown-linux-gnu, 1.79.0, sudo apt update && sudo apt install gcc-multilib)	57s
linux (i686-unknown-linux-gnu, stable, sudo apt update && sudo apt install gcc-multilib)	1m 4s
build (1.79.0, loongarch64-unknown-linux-gnu)	18s
cross (1.79.0, aarch64-unknown-linux-gnu, default)	44s
cross (1.79.0, powerpc-unknown-linux-gnu, default)	38s
linux (x86_64-unknown-linux-gnu, 1.79.0)	46s
build (stable, thumbv7em-none-eabi)	33s
cross (stable, aarch64-unknown-linux-gnu, default)	37s
linux (x86_64-unknown-linux-gnu, stable)	47s
build (stable, wasm32-unknown-unknown)	28s
cross (stable, powerpc-unknown-linux-gnu, default)	36s
build (stable, loongarch64-unknown-linux-gnu)	17s
macos (1.79.0)	46s
macos (stable)	27s
windows (1.79.0, x86_64-pc-windows-gnu)	59s
windows (stable, x86_64-pc-windows-gnu)	1m 37s
	16m 3s

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