Use `allow(missing_docs)` in benches (#270) #319

Job	Run time
test (stable)	20s
test (1.85.0)	24s
build (1.85.0, wasm32-unknown-unknown)	18s
build (stable, thumbv7em-none-eabi)	14s
build (1.85.0, thumbv7em-none-eabi)	20s
build (stable, wasm32-unknown-unknown)	14s
minimal-versions / minimal-versions	18s
	2m 8s

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