fix typo.
minor #3967 fix typo. (yositani2002)

This PR was merged into the 2.3 branch.

Discussion
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fix typo.

two notes does not show.

| Q             | A
| ------------- | ---
| Doc fix?      | yes
| New docs?     | no
| Applies to    | all
| Fixed tickets |

Commits
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957c46d fix typo.