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

Job	Run time
set-msrv / set-msrv	4s
minimal-versions / minimal-versions	42s
test (1.85.0)	26s
test (stable)	26s
build (1.85.0, wasm32-unknown-unknown)	22s
build (stable, wasm32-unknown-unknown)	22s
build (1.85.0, thumbv7em-none-eabi)	25s
build (stable, thumbv7em-none-eabi)	26s
	3m 13s

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