ticdc: minor adjust the description of foreign_key_checks

[hongyunyan]

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[lilin90]

/lgtm

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[LGTM Timeline notifier]

Timeline:

• 2025-05-29 03:36:57.501326774 +0000 UTC m=+76438.563344386: ☑️ agreed by lilin90.

[lilin90]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #20424.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #20425.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #20426.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #20427.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #20428.