Create migration notes in Rust docs for v22 #4469

Job	Run time
build-fuzz	2m 44s
check-git-rev-deps	18s
cargo-deny (advisories)	45s
build-and-test (msrv, ubuntu-latest, x86_64-unknown-linux-gnu)	8m 5s
cargo-deny (bans licenses sources)	38s
docs	2m 4s
build-and-test (msrv, ubuntu-latest, aarch64-unknown-linux-gnu, true)	4m 50s
fmt	21s
build-and-test (msrv, windows-latest, x86_64-pc-windows-msvc)	19m 15s
build-and-test (latest, ubuntu-latest, x86_64-unknown-linux-gnu)	7m 41s
migration-docs	26s
publish-dry-run	0s
build-and-test (latest, ubuntu-latest, aarch64-unknown-linux-gnu, true)	4m 46s
readme	2m 41s
build-and-test (latest, windows-latest, x86_64-pc-windows-msvc)	19m 58s
semver-checks	5m 56s
complete	1s
	1h 20m 29s

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