lightning: fix the behavior of "tidb.tls"

[Frank945946]

First-time contributors' checklist

• [ ] I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

Update tidb-lightning-configuration.md

Fix the behavior of the TiDB Lightning configuration item "tidb.tls"

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• [ ] master (the latest development version)
• [ ] v8.1 (TiDB 8.1 versions)
• [x] v8.0 (TiDB 8.0 versions)
• [x] v7.6 (TiDB 7.6 versions)
• [x] v7.5 (TiDB 7.5 versions)
• [x] v7.1 (TiDB 7.1 versions)
• [x] v6.5 (TiDB 6.5 versions)
• [x] v6.1 (TiDB 6.1 versions)
• [x] v5.4 (TiDB 5.4 versions)
• [x] v5.3 (TiDB 5.3 versions)
• [x] v5.2 (TiDB 5.2 versions)
• [x] v5.1 (TiDB 5.1 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• [ ] Delete files
• [ ] Change aliases
• [ ] Need modification after applied to another branch
• [ ] Might cause conflicts after applied to another branch

[ti-chi-bot[bot]]

@Oreoxmt: Your lgtm message is repeated, so it is ignored.

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-05-17 04:47:57.100749004 +0000 UTC m=+1801430.857884577: :ballot_box_with_check: agreed by Oreoxmt.
• 2024-05-17 07:49:56.166667677 +0000 UTC m=+1812349.923803251: :ballot_box_with_check: agreed by lance6716.

[Oreoxmt]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Oreoxmt

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.1: #17386.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.3: #17387.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #17388.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #17389.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #17390.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.2: #17391.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-5.4: #17392.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #17393.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #17394.