Update the related variable description for CREATE INDEX (#6434)#6463

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ti-chi-bot merged 2 commits intopingcap:release-5.2from ti-chi-bot:cherry-pick-6434-to-release-5.2

Sep 14, 2021

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Commits on Sep 14, 2021

Update sql-statement-create-index.md

shichun-0415
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ti-chi-bot
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Update sql-statements/sql-statement-create-index.md

authored and
ti-chi-bot
committed