Update settings.md

Убрал лишние символы в заголовке настройки allow_nullable_key.
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Dmitriy 2020-12-14 23:37:03 +03:00
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@ -2410,7 +2410,7 @@ Result:
{"number":"1"}
{"number":"2"}
```
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## allow_nullable_key {#allow-nullable-key}
Allows using of the [Nullable](../../sql-reference/data-types/nullable.md#data_type-nullable)-typed values in a sorting and a primary key for [MergeTree](../../engines/table-engines/mergetree-family/mergetree.md#table_engines-mergetree) tables.