Add docs

docs/producing-messages/1-producing-messages.md

@@ -23,4 +23,16 @@ Kafka::asyncPublish('broker')->onTopic('topic-name')
 ```
 
 The main difference is that the Async Producer is a singleton and will only flush the producer when the application is shutting down, instead of after each send or batch send. 
-This reduces the overhead when you want to send a lot of messages in your request handlers. 
+This reduces the overhead when you want to send a lot of messages in your request handlers. 
+
+When doing async publishing, the builder is stored in memory during the entire request. If you need to use a fresh producer, you may use the `fresh` method
+available on the `Kafka` facade (added in v2.2.0). This method will return a fresh Kafka Manager, which you can use to produce messages with a newly created producer builder.
+
+
+```php
+use Junges\Kafka\Facades\Kafka;
+
+Kafka::fresh()
+    ->asyncPublish('broker')
+    ->onTopic('topic-name')
+```