planner: add document about some new introduced hints (#14392)#14857

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ti-chi-bot[bot] merged 6 commits intopingcap:release-7.1from ti-chi-bot:cherry-pick-14392-to-release-7.1

Oct 25, 2023

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Commits on Sep 18, 2023

Add temp.md

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Delete temp.md

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add translation

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Update optimizer-hints.md

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Update optimizer-hints.md

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Commits on Oct 25, 2023

Merge branch 'release-7.1' into cherry-pick-14392-to-release-7.1
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