docs: enable some useful rustdoc features on docs.rs #2264

Job	Run time
docs	56s
check no_std	51s
clippy	1m 8s
features stable	2m 11s
features stable --all-targets	3m 11s
fmt	10s
miri --no-default-features	3m 51s
features nightly	2m 35s
test ubuntu-latest stable --no-default-features	1m 21s
miri	3m 51s
features nightly --all-targets	3m 23s
wasm	35s
miri --all-features	3m 52s
test ubuntu-latest stable	1m 20s
test ubuntu-latest nightly --no-default-features	1m 15s
test ubuntu-latest nightly	1m 12s
test ubuntu-latest 1.81 --no-default-features	41s
test ubuntu-latest 1.81	39s
test windows-latest stable --no-default-features	2m 28s
test windows-latest stable	2m 31s
test windows-latest nightly --no-default-features	2m 34s
test windows-latest nightly	2m 38s
test windows-latest 1.81 --no-default-features	1m 24s
test windows-latest 1.81	1m 27s
test ubuntu-latest 1.81 --features json	40s
test windows-latest 1.81 --features json	1m 46s
test ubuntu-latest nightly --all-features	1m 24s
test windows-latest nightly --all-features	2m 57s
deny / cargo deny check	19s
ci success	3s
	53m 13s

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