Modify the inaccuracies in the TLS description

[lianan-352889950]

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What is changed, added or deleted? (Required)

Some descriptions were inaccurate and did not align with the current state of TiDB Cloud products. These inaccuracies caused inconvenience to users. To address this issue, adjustments have been made to ensure that the document aligns as closely as possible with the current status of TiDB Cloud products.

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Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ qiancai
❌ lianan-352889950

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Thank you, and welcome to pingcap/docs. 😃

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-14 01:59:11.880694236 +0000 UTC m=+4127949.467804382: ☑️ agreed by qiancai.
• 2023-11-14 02:10:40.056571501 +0000 UTC m=+4128637.643681646: ☑️ agreed by hfxsd.

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[qiancai]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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