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Update json-functions.md

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docs/en/sql-reference/functions/json-functions.md
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@ -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`. [String](../data-types/string.md).
- 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).
**Examples**
@ -520,7 +520,7 @@ JSONExtractUInt(json [, indices_or_keys]...)
**Returned value**
- Returns a UInt value if it exists, otherwise it returns `Null`. [UInt64](../data-types/string.md).
- Returns a UInt value if it exists, otherwise it returns `0`. [UInt64](../data-types/int-uint.md).
**Examples**
@ -560,7 +560,7 @@ JSONExtractInt(json [, indices_or_keys]...)
**Returned value**
- Returns an Int value if it exists, otherwise it returns `Null`. [Int64](../data-types/int-uint.md).
- Returns an Int value if it exists, otherwise it returns `0`. [Int64](../data-types/int-uint.md).
**Examples**
@ -600,7 +600,7 @@ JSONExtractFloat(json [, indices_or_keys]...)
**Returned value**
- Returns an Float value if it exists, otherwise it returns `Null`. [Float64](../data-types/float.md).
- Returns an Float value if it exists, otherwise it returns `0`. [Float64](../data-types/float.md).
**Examples**