Create migration notes in Rust docs for v22 #4466

Job	Run time
cargo-deny (advisories)	40s
build-fuzz	2m 55s
cargo-deny (bans licenses sources)	50s
check-git-rev-deps	20s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	8m 3s
docs	4m 33s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	4m 56s
fmt	26s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	18m 30s
migration-docs	28s
publish-dry-run	0s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	8m 14s
readme	2m 47s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	4m 58s
semver-checks	4m 47s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	18m 46s
complete	1s
	1h 21m 14s

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