doc: correct subquery optimization examples for clarity (#20274)#20279

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ti-chi-bot[bot] merged 1 commit intopingcap:release-8.4from ti-chi-bot:cherry-pick-20274-to-release-8.4

Feb 13, 2025

+1-1

Commits on Feb 13, 2025

doc: correct subquery optimization examples for clarity

Rustin170506
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