Remove explicit passing of the `docsrs` configuration flag #2705

Job	Run time
test (stable)	23s
build (1.85.0, wasm32-unknown-unknown)	29s
test (1.85.0)	17s
build (stable, thumbv7em-none-eabi)	20s
build (stable, wasm32-unknown-unknown)	19s
build (1.85.0, thumbv7em-none-eabi)	19s
	2m 7s

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