Configure docs for feature gates globally (#1565) #581

Job	Run time
format/nightly	13s
miri	10m 46s
nostd/thumbv6m-none-eabi/stable	11s
Pass MSRV values to other jobs	2s
cargo-careful	1m 43s
clippy/stable	16s
docs/nightly	22s
cross_test/i686-unknown-linux-gnu/stable	1m 46s
cross_test/s390x-unknown-linux-gnu/stable	8m 12s
blas-msrv	46s
tests/1.64.0	3m 22s
tests/stable	2m 28s
tests/nightly	2m 34s
tests/beta	2m 19s
conclusion	2s
	35m 2s

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