Create migration notes in Rust docs for v22 #4473

Job	Run time
semver-checks	6m 17s
cargo-deny (advisories)	46s
cargo-deny (bans licenses sources)	48s
build-fuzz	3m 30s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	8m 0s
check-git-rev-deps	19s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	4m 56s
docs	5m 25s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	18m 59s
fmt	24s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	7m 42s
migration-docs	17s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	5m 5s
publish-dry-run	0s
readme	3m 16s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	21m 3s
complete	1s
	1h 26m 48s

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