Update changelog and clarify about yanking #2863

Job	Run time
cargo bench	1m 10s
cargo +1.36 build (futures-{core, io, sink})	34s
cargo +stable build	34s
cargo +beta build	39s
cargo clippy	25s
cargo doc	18s
cargo +nightly build	38s
cargo hack check --feature-powerset	2m 26s
cargo fmt	5s
cargo minimal-versions build	26s
cargo miri test	12m 59s
cargo build --target thumbv7m-none-eabi	25s
cargo test -Z sanitizer=address	3m 30s
cargo build --target thumbv6m-none-eabi	24s
cargo test -Z sanitizer=memory	5m 2s
cargo test (ubuntu-latest)	2m 54s
cargo +1.56 build	1m 6s
cargo test -Z sanitizer=thread	2m 28s
cargo test (macos-latest)	5m 36s
cargo test (windows-latest)	4m 55s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 26s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 26s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 45s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 27s
	1h 6m 38s

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