Migrate from `doc_auto_cfg` to `doc_cfg` (#740) #189

Job	Run time
minimal-versions / minimal-versions	48s
set-msrv / set-msrv	3s
test (stable)	51s
test (1.85.0)	56s
build (1.85.0, wasm32-unknown-unknown)	28s
build (stable, wasm32-unknown-unknown)	29s
build (1.85.0, thumbv7em-none-eabi)	32s
cross (1.85.0, powerpc-unknown-linux-gnu, default)	55s
cross (stable, powerpc-unknown-linux-gnu, default)	1m 28s
cross (1.85.0, aarch64-unknown-linux-gnu, default)	52s
build (stable, thumbv7em-none-eabi)	28s
cross (stable, aarch64-unknown-linux-gnu, default)	56s
	8m 46s

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