Little improvement for JavaDoc

Author: MicWalter

src/main/java/com/hivemq/extensions/kafka/api/model/KafkaHeader.java

@@ -23,7 +23,7 @@
 import java.nio.charset.Charset;
 
 /**
- * * Represents the header of a Kafka record, that was either read from or should be written to a Kafka cluster.
+ * Represents the header of a Kafka record, that was either read from or should be written to a Kafka cluster.
  * <p>
  * The internal state of this interface is completely immutable. All returned {@link ByteBuffer}s are read only and a
  * deep copy of any {@code byte[]} is made for every method call returning one.

src/main/java/com/hivemq/extensions/kafka/api/transformers/mqtttokafka/MqttToKafkaTransformer.java

@@ -24,7 +24,7 @@
  * Implement this transformer for the programmatic creation of {@link com.hivemq.extensions.kafka.api.model.KafkaRecord}s
  * from {@link com.hivemq.extension.sdk.api.packets.publish.PublishPacket}s.
  * <p>
- * Your implementation of the  MqttToKafkaTransformer must be placed in a java archive (.jar) together with all its
+ * Your implementation of the MqttToKafkaTransformer must be placed in a java archive (.jar) together with all its
  * dependencies in the {@code extensions} folder of the HiveMQ Enterprise Extension for Kafka. In addition a {@code
  * <mqtt-to-kafka-transformer>} referencing the implementing class via its canonical name must be configured in the
  * {@code kafka-extension.xml} file.
@@ -36,7 +36,7 @@
 public interface MqttToKafkaTransformer extends Transformer<MqttToKafkaInitInput> {
 
     /**
-     * This callback is executed for every mqtt PUBLISH that arrives at your HiveMQ cluster matching the in the {@code
+     * This callback is executed for every MQTT PUBLISH that arrives at your HiveMQ cluster matching the in the {@code
      * <mqtt-to-kafka-transformer>} tag configured {@code <mqtt-topic-filters>}. It allows the publication of any number
      * of {@link com.hivemq.extensions.kafka.api.model.KafkaRecord}s via the {@link MqttToKafkaOutput} object.
      *