Fix a typo in code snippet

The code snippet in `mysql-to-parquet-csv-json.md` seems to contain a typo. This PR fixes it.

Author: klaudiagrz

knowledgebase/mysql-to-parquet-csv-json.md

@@ -71,7 +71,7 @@ To go from MySQL to JSON, just change the extension on the filename to `jsonl` o
 
 ```bash
 ./clickhouse local -q "SELECT * FROM
-   mysqlql(
+   mysql(
     'localhost:3306',
     'my_sql_database',
     'my_sql_table',
@@ -81,4 +81,4 @@ To go from MySQL to JSON, just change the extension on the filename to `jsonl` o
 INTO OUTFILE 'my_output_file.ndjson'"
 ```
 
-It's impressive how simple yet powerful the `clickhouse-local` tool really is. You can easily read data from a database like MySQL and output it into [all types of different output formats](https://clickhouse.com/docs/en/sql-reference/formats/).
+It's impressive how simple yet powerful the `clickhouse-local` tool really is. You can easily read data from a database like MySQL and output it into [all types of different output formats](https://clickhouse.com/docs/en/sql-reference/formats/).