release-8.5: add note about table aliases in FOR UPDATE OF clause (#22568)

[ti-chi-bot]

This is an automated cherry-pick of #22568

First-time contributors' checklist

• 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)

Added a note about table aliases in the FOR UPDATE OF clause

ZH PR: pingcap/docs-cn#21489

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.

• 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:
• Other reference link(s): planner: support table aliases in FOR UPDATE OF Clause tidb#65532

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]

Code Review

This pull request updates the SELECT statement documentation to include information about table alias support in the FOR UPDATE OF clause starting from TiDB v8.5.6, detailing backward compatibility and table matching logic. The review feedback suggests simplifying the language by removing unnecessary words and using the present tense to align with the documentation style guide, specifically recommending more direct instructions.

[lilin90]

/approve

[ti-chi-bot]

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Test name	Commit	Details	Required	Rerun command
pull-verify	10bc786	link	true	/test pull-verify

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