fix spelling mistake #2246

Job	Run time
cargo clippy	40s
cargo bench	1m 11s
cargo +stable build	55s
cargo +beta build	1m 2s
cargo +nightly build	1m 17s
codegen	30s
cargo doc	30s
cargo +1.36 build (futures-{core, io, sink})	2m 17s
cargo fmt	5s
cargo hack check --feature-powerset	4m 8s
cargo minimal-versions build	35s
cargo miri test	13m 30s
cargo build --target thumbv7m-none-eabi	46s
cargo build --target thumbv6m-none-eabi	37s
cargo test -Z sanitizer=address	4m 33s
cargo test -Z sanitizer=memory	3m 36s
cargo test -Z sanitizer=thread	2m 59s
cargo test (ubuntu-latest)	4m 7s
cargo test (macos-latest)	6m 41s
cargo test (windows-latest)	6m 35s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 58s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	8m 9s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	11m 17s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	4m 58s
cargo +1.56 build	2m 17s
	1h 27m 13s

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