ttl: updated ttl TTL_JOB_INTERVAL description

[lcwangchao]

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• This PR is translated from: ttl: updated ttl TTL_JOB_INTERVAL description docs#19566
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[YangKeao]

LGTM

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[hfxsd]

Suggested change

	`TTL_JOB_INTERVAL` 的默认值是 `24h` (v8.5 及之前的版本为 `1h`)。
	`TTL_JOB_INTERVAL` 的默认值是 `24h`。在 v8.5.0 及之前的版本中，默认值为 `1h`。

[lcwangchao]

如果之后发布了 8.5.1 这样说会不会不准确？

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