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Update docs/en/engines/table-engines/mergetree-family/mergetree.md

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Co-authored-by: Anna <42538400+adevyatova@users.noreply.github.com>
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@ -418,7 +418,7 @@ Reading from a table is automatically parallelized.
Determines the lifetime of values.
The `TTL` clause can be set for the whole table and for each individual column. Table-level `TTL` can also specify the logic of automatic move of data between disks and volumes, or recompression of parts where all the data has been expired.
The `TTL` clause can be set for the whole table and for each individual column. Table-level `TTL` can also specify the logic of automatic moving of data between disks and volumes, or recompression of parts where all the data has been expired.
Expressions must evaluate to [Date](../../../sql-reference/data-types/date.md) or [DateTime](../../../sql-reference/data-types/datetime.md) data type.