fix error in example
Former-commit-id: af0856c97657091b243762d05080d02dba735025 Former-commit-id: 42eab06c1e57b45f0cb92570d3fb75ced49f3a48 Former-commit-id: 555acccdb1e61309fff721f4fc9dd2079e566714
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Former-commit-id: af0856c97657091b243762d05080d02dba735025 Former-commit-id: 42eab06c1e57b45f0cb92570d3fb75ced49f3a48 Former-commit-id: 555acccdb1e61309fff721f4fc9dd2079e566714