cdc: update output-raw-change-event comment link

[Oreoxmt]

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• master (the latest development version)
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• v8.1 (TiDB 8.1 versions)
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What is the related PR or file link(s)?

• This PR is translated from: cdc: update output-raw-change-event comment link docs-cn#18308
• Other reference link(s):

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• Delete files
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• Need modification after applied to another branch
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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-08-07 06:53:41.718833766 +0000 UTC m=+421351.585932852: ☑️ agreed by hfxsd.

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[Oreoxmt]

/approve

[ti-chi-bot]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #18547.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #18548.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #18549.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.2: #18550.