slow_query: update the doc

[Oreoxmt]

First-time contributors' checklist

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

What is changed, added or deleted? (Required)

• Add the following fields: Optimize_time, Wait_TS, Index_names, Stats, Plan_from_binding, Has_more_results, KV_total, PD_total, Backoff_total, Write_sql_response_total, Result_rows, IsExplicitTxn Host Num_cop_tasks
• Fix a typo transaction_ts

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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.

• [x] master (the latest development version)
• [ ] v6.2 (TiDB 6.2 versions)
• [x] v6.1 (TiDB 6.1 versions)
• [ ] v5.4 (TiDB 5.4 versions)
• [ ] v5.3 (TiDB 5.3 versions)
• [ ] v5.2 (TiDB 5.2 versions)
• [ ] v5.1 (TiDB 5.1 versions)
• [ ] v5.0 (TiDB 5.0 versions)

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

• This PR is translated from: https://github.com/pingcap/docs-cn/pull/8801
• 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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[Oreoxmt]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 8394c7f78b93d6f49f9ba68f7e42985cfed0c769

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.2: #12112.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.3: #12113.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #12114.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #12115.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.0: #12116.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #12117.