Remove a redundant space in example #2434

Job	Run time
cargo clippy	26s
cargo bench	51s
cargo +stable build	37s
cargo +1.36 build (futures-{core, io, sink})	1m 0s
cargo +beta build	39s
cargo doc	18s
cargo hack check --feature-powerset	2m 18s
cargo +nightly build	43s
cargo fmt	8s
cargo minimal-versions build	26s
cargo miri test	8m 51s
cargo build --target thumbv7m-none-eabi	34s
cargo test -Z sanitizer=address	5m 24s
cargo build --target thumbv6m-none-eabi	27s
cargo test -Z sanitizer=memory	4m 7s
cargo +1.56 build	1m 2s
cargo test (ubuntu-latest)	3m 6s
cargo test -Z sanitizer=thread	2m 45s
cargo test (macos-latest)	6m 38s
cargo test (windows-latest)	4m 57s
cargo test (ubuntu-latest, aarch64-unknown-linux-gnu)	3m 11s
cargo test (ubuntu-latest, armv7-unknown-linux-gnueabihf)	6m 6s
cargo test (ubuntu-latest, armv5te-unknown-linux-gnueabi)	6m 42s
cargo test (ubuntu-latest, i686-unknown-linux-gnu)	3m 24s
	1h 4m 40s

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