sql statement: add RU calcuation to explain docs (#15255)#15266

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ti-chi-bot[bot] merged 4 commits intopingcap:release-7.2from ti-chi-bot:cherry-pick-15255-to-release-7.2

Oct 17, 2023

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Commits on Oct 17, 2023

Update sql-statement-explain-analyze.md

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Update sql-statements/sql-statement-explain-analyze.md

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Update sql-statements/sql-statement-explain-analyze.md

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