planner: add document about some new introduced hints (#14664)#14698

Merged

ti-chi-bot[bot] merged 7 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-14664-to-release-6.5

Sep 21, 2023

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Commits on Aug 3, 2023

fixup

qw4990
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ti-chi-bot
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fixup

qw4990
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ti-chi-bot
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fixup

qw4990
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ti-chi-bot
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fixup

qw4990
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ti-chi-bot
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fixup

qw4990
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Update optimizer-hints.md

ran-huang
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Update optimizer-hints.md

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