fix the table schema for cluster_tidb_index_usage

[YangKeao]

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What is changed, added or deleted? (Required)

Previously, the table schema for cluster_tidb_index_usage is wrong 🤦 . It's caused by a careless copy-paste. Now it's modified to the correct table schema.

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• v8.4 (TiDB 8.4 versions)
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What is the related PR or file link(s)?

• This PR is translated from: fix the table schema for cluster_tidb_index_usage docs-cn#18525
• 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

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-25 01:55:58.82906835 +0000 UTC m=+1613148.917870892: ☑️ agreed by qiancai.

[qiancai]

/approve

[ti-chi-bot]

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #19792.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #19793.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19794.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.2: #19795.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.3: #19796.