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Update docs/en/sql-reference/functions/string-functions.md

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Co-authored-by: olgarev <56617294+olgarev@users.noreply.github.com>
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@ -18,7 +18,7 @@ Checks whether the input string is empty.
empty(x)
```
A string is considered non-empty if it contains at least one byte, even if this is a space or a null byte. The UUID is empty if it contains all zeros (zero UUID).
A string is considered non-empty if it contains at least one byte, even if this is a space or a null byte.
The function also works for [arrays](array-functions.md#function-empty) or [UUID](uuid-functions.md#empty).