sql: fix error in tidb_ddl_job

[hfxsd]

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• This PR is translated from:sql: fix error in tidb_ddl_job docs-cn#18730
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-30 09:19:03.916477178 +0000 UTC m=+260099.336690189: ☑️ agreed by qiancai.

[hfxsd]

/approve

[ti-chi-bot]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19021.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.2: #19022.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.3: #19023.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #19024.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #19025.