docs: enable some useful rustdoc features on docs.rs #2265

Job	Run time
check no_std	47s
miri --no-default-features	5m 19s
clippy	49s
miri	5m 19s
features stable	1m 31s
miri --all-features	8m 12s
features stable --all-targets	2m 58s
features nightly	1m 44s
wasm	21s
features nightly --all-targets	2m 49s
test ubuntu-latest stable --no-default-features	51s
docs	33s
test ubuntu-latest stable	53s
test ubuntu-latest nightly --no-default-features	47s
fmt	11s
test ubuntu-latest nightly	55s
test ubuntu-latest 1.81 --no-default-features	31s
test ubuntu-latest 1.81	28s
test windows-latest stable --no-default-features	2m 48s
test windows-latest stable	1m 54s
test windows-latest nightly --no-default-features	2m 6s
test windows-latest nightly	1m 45s
test windows-latest 1.81 --no-default-features	1m 29s
test windows-latest 1.81	1m 5s
test ubuntu-latest 1.81 --features json	29s
test windows-latest 1.81 --features json	1m 6s
test ubuntu-latest nightly --all-features	1m 4s
test windows-latest nightly --all-features	2m 42s
deny / cargo deny check	17s
ci success	1s
	51m 44s

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