ticdc: add description about safe-mode arguments

[lidezhu]

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Timeline:

• 2025-02-18 06:58:37.819435244 +0000 UTC m=+944560.215657306: ☑️ agreed by qiancai.

[qiancai]

/approve

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #19864.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #19865.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19866.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #19867.