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const-oid: improve rustdoc on `Arc` #3242

Job	Run time
build (1.81.0, thumbv7em-none-eabi)	30s
build (1.81.0, wasm32-unknown-unknown)	31s
build (stable, thumbv7em-none-eabi)	31s
minimal-versions	0s
build (stable, wasm32-unknown-unknown)	34s
test (1.81.0)	1m 8s
test (stable)	1m 9s
	4m 23s

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