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DOCS-443: merge_max_block_size for MergeTree description (#9112)

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* CLICKHOUSEDOCS-443: merge_max_block_size setting for MergeTree.
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docs/en/operations/table_engines/mergetree.md
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@ -88,6 +88,7 @@ For a description of parameters, see the [CREATE query description](../../query_
<a name="mergetree_setting-merge_with_ttl_timeout"></a>
- `merge_with_ttl_timeout` — Minimum delay in seconds before repeating a merge with TTL. Default value: 86400 (1 day).
- `write_final_mark` — Enables or disables writing the final index mark at the end of data part. Default value: 1. Don't turn it off.
- `merge_max_block_size` — Maximum number of rows in block for merge operations. Default value: 8192.
- `storage_policy` — Storage policy. See [Using Multiple Block Devices for Data Storage](#table_engine-mergetree-multiple-volumes).

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docs/ru/operations/table_engines/mergetree.md
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@ -88,6 +88,7 @@ CREATE TABLE [IF NOT EXISTS] [db.]table_name [ON CLUSTER cluster]
<a name="mergetree_setting-merge_with_ttl_timeout"></a>
- `merge_with_ttl_timeout` — минимальное время в секундах перед повторным слиянием с TTL. По умолчанию — 86400 (1 день).
- `write_final_mark` — включает или отключает запись последней засечки индекса в конце куска данных. По умолчанию — 1. Не отключайте её.
- `merge_max_block_size` — Максимальное количество строк в блоке для операций слияния. Значение по умолчанию: 8192.
- `storage_policy` — политика хранения данных. Смотрите [Хранение данных таблицы на нескольких блочных устройствах](#table_engine-mergetree-multiple-volumes).
**Пример задания секций**