docs: fix format for TiKV and PD configuration file template invalid. (#6197)#6202

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ti-chi-bot merged 1 commit intopingcap:release-5.0from ti-chi-bot:cherry-pick-6197-to-release-5.0

Aug 20, 2021

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Commits on Aug 20, 2021

docs: fix format for TiKV and PD configuration file template invalid. (pingcap#6145 )

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