Revise error handling documentation for Kafka integration

Updated error handling section to reflect changes in dead letter queue usage and added relevant links.

Author: lesandie

content/en/altinity-kb-integrations/altinity-kb-kafka/04-operations-troubleshooting/error-handling.md

@@ -56,16 +56,19 @@ FROM default.kafka_engine
 WHERE length(_error) > 0
 ```
 
-## Since 25.8 
+[https://github.com/ClickHouse/ClickHouse/pull/20249](https://github.com/ClickHouse/ClickHouse/pull/20249)
 
-dead letter queue can be used via setting: `kafka_handle_error_mode='dead_letter'` [https://github.com/ClickHouse/ClickHouse/pull/68873](https://github.com/ClickHouse/ClickHouse/pull/68873)
+[https://github.com/ClickHouse/ClickHouse/pull/21850](https://github.com/ClickHouse/ClickHouse/pull/21850)
 
+[https://altinity.com/blog/clickhouse-kafka-engine-faq](https://altinity.com/blog/clickhouse-kafka-engine-faq)
 
 
-![Table connections](/assets/Untitled-2021-08-05-1027.png)
+## Since 25.8 
 
-[https://github.com/ClickHouse/ClickHouse/pull/20249](https://github.com/ClickHouse/ClickHouse/pull/20249)
+dead letter queue can be used via setting: `kafka_handle_error_mode='dead_letter_queue'` [https://github.com/ClickHouse/ClickHouse/pull/68873](https://github.com/ClickHouse/ClickHouse/pull/68873)
+
+and error related data will be saved in `system.dead_letter_queue` table.
+
+![Table connections](/assets/Untitled-2021-08-05-1027.png)
 
-[https://github.com/ClickHouse/ClickHouse/pull/21850](https://github.com/ClickHouse/ClickHouse/pull/21850)
 
-[https://altinity.com/blog/clickhouse-kafka-engine-faq](https://altinity.com/blog/clickhouse-kafka-engine-faq)