Add missing explain formats

[yusra1007]

What is changed, added or deleted? (Required)

translate doc en to cn#15601

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• master (the latest development version)
• v7.6 (TiDB 7.6 versions)
• v7.5 (TiDB 7.5 versions)
• v7.4 (TiDB 7.4 versions)
• v7.3 (TiDB 7.3 versions)
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• v5.1 (TiDB 5.1 versions)
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What is the related PR or file link(s)?

• This PR is translated from: Add missing explain formats docs#15601
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
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• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

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All committers have signed the CLA.

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[qiancai]

Hi @yusra1007, thanks for your contribution. I've added a few comments. PTAL.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-29 04:13:47.585312625 +0000 UTC m=+1366069.149610331: ☑️ agreed by hfxsd.
• 2024-01-29 05:00:33.870764226 +0000 UTC m=+1368875.435061932: ☑️ agreed by qiancai.

[qiancai]

/approve

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This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #16411.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.3: #16412.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.6: #16413.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.4: #16414.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #16415.