TiDB vector search doc

[EricZequan]

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)

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)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 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)
• v5.3 (TiDB 5.3 versions))

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

• This PR is translated from:
• Other reference link(s): Vector Search tidb#54245

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

[CLAassistant]

All committers have signed the CLA.

[EricZequan]

/cc @breezewish

[breezewish]

有些累，基本每一行我都提了一个 comment 以便让这个文本读起来更正常，请自行对其他文档进行这样的改动，让它变得可读，尤其需要注意语序上中文和英文语序是不一样的，你需要调整各行的语序、必要的时候补充一些细节，使得内容是读起来是顺畅的、符合中文语法的、易于理解的。英文文档由于大家水平问题并不一定每句话都能表达清楚，也不强求，意思到了就可以，但作为母语的中文文档，应当具备最完备、最易于理解、最没有歧义的内容，因此必要的时候需要扩写、澄清一些细节。

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-09-11 03:41:29.537617583 +0000 UTC m=+414159.278041518: ☑️ agreed by Icemap.
• 2024-10-21 08:29:51.166475032 +0000 UTC m=+253391.863265640: ☑️ agreed by hfxsd.

[JaySon-Huang]

LGTM

[EricZequan]

LGTM

[lilin90]

/lgtm

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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• OWNERS [qiancai]

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