doc: correct subquery optimization examples for clarity (#19825)#19827

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ti-chi-bot[bot] merged 3 commits intopingcap:release-8.1from ti-chi-bot:cherry-pick-19825-to-release-8.1

Feb 13, 2025

+1-1

Commits on Feb 13, 2025

Add temp.md

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Delete temp.md

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Update subquery-optimization.md

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