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Update docs/zh/faq/operations/delete-old-data.md

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@ -16,7 +16,7 @@ ClickHouse 允许在某些条件发生时自动删除值。这个条件被配置
这种方法的主要优势是它不需要任何外部系统来触发，一旦配置了 TTL，数据删除就会自动在后台发生。
:::note
TTL也可以用来将数据移动到非 [/dev/null](https://en.wikipedia.org/wiki/Null_device) 的不同存储系统，例如从SSD到HDD。
TTL 也可以用来将数据移动到非 [/dev/null](https://en.wikipedia.org/wiki/Null_device) 的不同存储系统，例如从 SSD 到 HDD。
:::
有关 [配置 TTL](../../engines/table-engines/mergetree-family/mergetree.md#table_engine-mergetree-ttl) 的更多详细信息。