fix cdc changefeed config

[charleszheng44]

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• This PR is translated from: fix cdc changefeed config error docs-cn#14353
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[qiancai]

/lgtm

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[lilin90]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-29 02:48:42.509876016 +0000 UTC m=+848687.911126466: ☑️ agreed by qiancai.
• 2023-06-29 03:38:55.470758253 +0000 UTC m=+851700.872008687: ☑️ agreed by lilin90.

[qiancai]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.6: #14046.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.0: #14047.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #14048.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.2: #14049.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #14050.