docs: link to changelogs in published crate READMEs #1393

Job	Run time
changed_paths	6s
cargo check (host)	3m 28s
cargo test (host)	4m 40s
build boot image (x86_64)	3m 14s
clippy	2m 54s
Loom tests (cordyceps)	1m 35s
docs	4m 15s
rustfmt	14s
cargo test (cross x64)	4m 23s
Miri tests (cordyceps)	2m 0s
Loom tests (maitake)	4m 21s
Miri tests (maitake)	18m 31s
Tests (maitake, no-default-features)	1m 42s
Loom tests (mycelium-util)	51s
all_systems_go	1s
	52m 15s

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