sysvar: add 12 sysvars to docs-cn (#11495)#11603

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ti-chi-bot merged 4 commits intopingcap:release-6.3from ti-chi-bot:cherry-pick-11495-to-release-6.3

Oct 13, 2022

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Commits on Oct 13, 2022

sysvar: add 13 sysvars to docs-cn

TomShawn
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Update system-variables.md

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Apply suggestions from code review

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