planner: update the SPM doc (#15136)#15164

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ti-chi-bot[bot] merged 12 commits intopingcap:release-7.4from ti-chi-bot:cherry-pick-15136-to-release-7.4

Oct 23, 2023

+30-52

Commits on Oct 23, 2023

fixup

qw4990
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fixup

qw4990
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ti-chi-bot
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Update sql-plan-management.md

qw4990
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ti-chi-bot
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Update sql-plan-management.md

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ti-chi-bot
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Update sql-plan-management.md

authored and
ti-chi-bot
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Update sql-plan-management.md

authored and
ti-chi-bot
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Update sql-plan-management.md

authored and
ti-chi-bot
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Update sql-plan-management.md

authored and
ti-chi-bot
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Update sql-plan-management.md

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ti-chi-bot
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Update sql-plan-management.md

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Update sql-plan-management.md

qiancai
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Apply suggestions from code review

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