docs: remove outdated limitation for MySQL table engine

The OS limitation was removed in ClickHouse#46316. Also verified that MySQL table engine support is working as expected on macOS by running a basic test locally.

Author: morsapaes

docs/en/engines/table-engines/integrations/mysql.md

@@ -38,10 +38,6 @@ The table structure can differ from the original MySQL table structure:
 - Column types may differ from those in the original MySQL table. ClickHouse tries to [cast](../../../engines/database-engines/mysql.md#data_types-support) values to the ClickHouse data types.
 - The [external_table_functions_use_nulls](/operations/settings/settings#external_table_functions_use_nulls) setting defines how to handle Nullable columns. Default value: 1. If 0, the table function does not make Nullable columns and inserts default values instead of nulls. This is also applicable for NULL values inside arrays.
 
-:::note
-The MySQL Table Engine is currently not available on the ClickHouse builds for MacOS ([issue](https://github.com/ClickHouse/ClickHouse/issues/21191))
-:::
-
 **Engine Parameters**
 
 - `host:port` — MySQL server address.