Update changelog and clarify about yanking #2862

Job	Run time
cargo bench	50s
cargo clippy	24s
cargo +1.36 build (futures-{core, io, sink})	32s
cargo +stable build	33s
cargo +beta build	39s
cargo doc	19s
cargo hack check --feature-powerset	2m 20s
cargo fmt	5s
cargo +nightly build	35s
cargo minimal-versions build	26s
cargo miri test	12m 52s
cargo build --target thumbv7m-none-eabi	24s
cargo test -Z sanitizer=address	3m 30s
cargo build --target thumbv6m-none-eabi	25s
cargo test -Z sanitizer=memory	4m 50s
cargo test -Z sanitizer=thread	2m 22s
cargo test (ubuntu-latest)	2m 38s
cargo +1.56 build	1m 8s
cargo test (macos-latest)	5m 51s
cargo test (windows-latest)	4m 55s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 57s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 21s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 50s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	4m 0s
	1h 6m 46s

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