docs: link to changelogs in published crate READMEs #1390

Job	Run time
changed_paths	5s
clippy	2m 49s
cargo test (host)	4m 42s
cargo check (host)	3m 52s
build boot image (x86_64)	3m 13s
Loom tests (cordyceps)	1m 28s
docs	4m 14s
rustfmt	19s
cargo test (cross x64)	4m 20s
Miri tests (cordyceps)	2m 3s
Loom tests (maitake)	4m 21s
Miri tests (maitake)	17m 56s
Tests (maitake, no-default-features)	1m 40s
Loom tests (mycelium-util)	50s
all_systems_go	0s
	51m 52s

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