fix very small typo #2405

Job	Run time
rustfmt-clippy	25s
minimal	18s
msrv	1m 0s
check-cfg	21s
docs	23s
quickchecking	19s
test-book	13s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	1m 51s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	1m 54s
test-expectations (ubuntu-latest)	54s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	1m 54s
test-expectations (macos-12)	1m 3s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	1m 59s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	2m 36s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	2m 24s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	2m 14s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	2m 15s
test (ubuntu-latest, 16.0, 1, 0, 0, 0, 0)	4m 17s
test (ubuntu-latest, 16.0, 1, 0, 0, 1, 0)	4m 4s
test (ubuntu-latest, 16.0, 1, 0, 1, 0, 0)	4m 7s
test (ubuntu-latest, 16.0, 1, 0, 1, 1, 0)	4m 20s
test (ubuntu-latest, 16.0, 1, 1, 0, 0, 0)	5m 8s
test (ubuntu-latest, 16.0, 1, 1, 0, 1, 0)	5m 22s
test (ubuntu-latest, 16.0, 1, 1, 1, 0, 0)	4m 38s
test (ubuntu-latest, 16.0, 1, 1, 1, 1, 0)	4m 42s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 49s
test (macos-12, 9.0, 0, 0, 0)	1m 32s
success	1s
	1h 2m 3s

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