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Update json-functions.md

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docs/en/sql-reference/functions/json-functions.md
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@ -468,7 +468,7 @@ SELECT JSONLength('{"a": "hello", "b": [-100, 200.0, 300]}') = 2
### JSONType
Return the type of a JSON value. If the value does not exist, `Null` will be returned.
Return the type of a JSON value. If the value does not exist, `Null` will be returned (not usual [Null](../data-types/nullable.md), but a special Null=0 of `Enum8('Null' = 0, 'String' = 34,...`). .
**Syntax**
@ -488,7 +488,7 @@ JSONType(json [, indices_or_keys]...)
**Returned value**
- Returns the type of a JSON value as a string, otherwise if the value doesn't exists it returns `Null`. [Enum](../data-types/enum.md).
- Returns the type of a JSON value as a string, otherwise if the value doesn't exists it returns `Null=0`. [Enum](../data-types/enum.md).
**Examples**