Update settings.md

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@ -2480,7 +2480,7 @@ Possible values:
- `'ALL'` — ClickHouse outputs all rows as a result of combining queries including duplicate rows.
- `''` — Clickhouse generates an exception when used with `UNION`.
Default value: `'DISTINCT'`.
Default value: `''`.
See examples in [UNION](../../sql-reference/statements/select/union.md).