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

Co-authored-by: Anna <42538400+adevyatova@users.noreply.github.com>
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@ -87,7 +87,7 @@ A function configuration contains the following settings:
The command must read arguments from STDIN and must output the result to STDOUT. The command must process arguments iteratively. That is after processing a chunk of arguments it must wait for the next chunk.
**Example**
The following example creates `test_function` using XML configuration.
Creating `test_function` using XML configuration:
```
<functions>
<function>