kem

Remove explicit passing of the `docsrs` configuration flag #1462

Job	Run time
test (1.85.0)	17s
test (stable)	26s
build (1.85.0, wasm32-unknown-unknown)	18s
build (stable, wasm32-unknown-unknown)	20s
build (stable, thumbv7em-none-eabi)	21s
build (1.85.0, thumbv7em-none-eabi)	21s
	2m 3s

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