fixed typo in 'false'

Author: chernser

docs/integrations/data-ingestion/kafka/kafka-clickhouse-connect-sink.md

@@ -157,7 +157,7 @@ Sink, use [Kafka Connect Transformations](https://docs.confluent.io/platform/cur
 
 - (1) - JSON is supported only when ClickHouse settings has `input_format_binary_read_json_as_string=1`. This works only for RowBinary format family and the setting affects all columns in the insert request so they all should be a string. Connector will convert STRUCT to a JSON string in this case. 
 
-- (2) - When struct has unions like `oneof` then converter should be configured to NOT add prefix/suffix to a field names. There is `generate.index.for.unions=fals` [setting for ProtobufConverter](https://docs.confluent.io/platform/current/schema-registry/connect.html#protobuf).  
+- (2) - When struct has unions like `oneof` then converter should be configured to NOT add prefix/suffix to a field names. There is `generate.index.for.unions=false` [setting for ProtobufConverter](https://docs.confluent.io/platform/current/schema-registry/connect.html#protobuf).  
 
 **Without a schema declared:**