update doc on wal-recovery-mode and use-direct-io-for-flush-and-compaction

[ekexium]

Signed-off-by: ekexium ekexium@gmail.com

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Complement the descriptions of wal-recovery-mode and use-direct-io-for-flush-and-compaction.
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[TomShawn]

/remove-status LGT1
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[TomShawn]

/merge

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Commit hash: 8e28478

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In response to a cherrypick label: new pull request created: #7025.