changefeed: add tips for Private Connect to Kafka SaaS services

[grovecai]

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[ti-chi-bot]

Hi @grovecai. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[qiancai]

Rest LGTM

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-01-09 03:16:42.371619224 +0000 UTC m=+409945.660450929: ☑️ agreed by qiancai.
• 2025-01-09 03:23:47.068471004 +0000 UTC m=+410370.357302707: ☑️ agreed by hfxsd.

[hfxsd]

/retest

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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