Pointing semi join to a page that actually mentions it. (#21871)

[ti-chi-bot]

This is an automated cherry-pick of #21871

close #21870

What is changed, added or deleted? (Required)

Pointing semi join to the page that explains it instead of the overview page that is not mentions it.

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[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 PR fixes a broken or inaccurate documentation link in subquery-optimization.md, redirecting the 'semi join' reference to a more specific and relevant page (/explain-subqueries.md#semi-join-correlated-subquery) that actually details semi joins. A minor grammatical correction was also included.

Highlights

• intent: The primary goal of this pull request is to correct a documentation link within the subquery-optimization.md file. Specifically, it aims to point the reference to 'semi join' to a more relevant and detailed page that actually explains 'semi join', rather than a general overview page that does not mention it.
• changes_summary: This pull request modifies a single file: subquery-optimization.md. The change involves updating a hyperlink on line 20. The old link /explain-overview.md for 'semi join' has been replaced with /explain-subqueries.md#semi-join-correlated-subquery, which provides a direct explanation of semi joins within the context of correlated subqueries. Additionally, a minor grammatical correction was made from 'TiDB do' to 'TiDB performs'.
• reviewer_activity: No specific reviewer activity has been recorded or provided in the context for this pull request yet.

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[gemini-code-assist]

Code Review

Thank you for this contribution. The updated link is much more specific and the grammar correction improves the documentation. I've added one minor suggestion to further enhance the readability of the sentence.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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