Fix typos (#2821) #2464

Job	Run time
cargo +stable build	39s
cargo +1.36 build (futures-{core, io, sink})	37s
cargo clippy	26s
cargo +beta build	44s
cargo bench	52s
cargo +nightly build	43s
cargo doc	19s
cargo fmt	11s
cargo hack check --feature-powerset	2m 32s
cargo build --target thumbv7m-none-eabi	27s
cargo minimal-versions build	28s
cargo miri test	8m 43s
cargo build --target thumbv6m-none-eabi	27s
cargo +1.56 build	1m 13s
cargo test -Z sanitizer=address	5m 32s
cargo test (ubuntu-latest)	3m 3s
cargo test (macos-latest)	7m 35s
cargo test (windows-latest)	4m 59s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 27s
cargo test -Z sanitizer=memory	4m 2s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 9s
cargo test -Z sanitizer=thread	2m 48s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 50s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 33s
	1h 6m 19s

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