v8.5.5: add doc for async-batch-get (#22152)

[ti-chi-bot]

This is an automated cherry-pick of #22152

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• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

async-batch-get introduces a new configure item, add doc for that.

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

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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 (in Chinese).

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

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

• This PR is translated from: add doc for async-batch-get docs-cn#21164
• 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

[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the TiDB documentation by introducing a new entry for the enable-async-batch-get configuration item. This addition provides users with clear information regarding a setting that influences the asynchronous behavior of the Batch Get operator, aiming to optimize performance by minimizing goroutine overhead. The documentation clarifies its function and default state, ensuring users understand its impact on the system.

Highlights

• New Configuration Item Documentation: Added comprehensive documentation for the new enable-async-batch-get configuration item, detailing its purpose, default value, and applicable versions.
• Performance Enhancement: The enable-async-batch-get setting controls the asynchronous execution of the Batch Get operator, which is designed to reduce goroutine overhead and improve performance.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the new enable-async-batch-get configuration item. My review focuses on improving the clarity and style of the new documentation to align with the repository's style guide, as the PR author is ti-chi-bot. I've suggested a minor wording update for better readability and consistency.

[ti-chi-bot]

@zyguan: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

@ti-chi-bot: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	6154da5	link	unknown	/test pull-verify

Full PR test history. Your PR dashboard.

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