k12

Migrate from `doc_auto_cfg` to `doc_cfg` (#740) #1326

Job	Run time
set-msrv / set-msrv	4s
test (1.85.0)	27s
test (stable)	28s
build (1.85.0, wasm32-unknown-unknown)	23s
build (stable, wasm32-unknown-unknown)	26s
build (1.85.0, thumbv7em-none-eabi)	25s
build (stable, thumbv7em-none-eabi)	24s
	2m 37s

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