Update string-functions.md

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@ -34,15 +34,15 @@ empty(x)
Запрос:
```sql
SELECT notempty('text');
SELECT empty('text');
```
Результат:
```text
┌─empty('')─┐
1
└───────────┘
┌─empty('text')─┐
0
└───────────────
```
## notEmpty {#notempty}