Fix typo in micronaut-kafka documentation (#250)

src/main/docs/guide/kafkaClient.adoc

@@ -1,4 +1,4 @@
-The example in the quick start presented a trivial definition of an interface that be implemented automatically for you using the ann:configuration.kafka.annotation.KafkaClient[] annotation.
+The example in the quick start presented a trivial definition of an interface that will be implemented automatically for you using the ann:configuration.kafka.annotation.KafkaClient[] annotation.
 
 The implementation that powers `@KafkaClient` (defined by the api:configuration.kafka.intercept.KafkaClientIntroductionAdvice[] class) is, however, very flexible and offers a range of options for defining Kafka clients.
 

src/main/docs/guide/kafkaClient/kafkaClientMethods.adoc

@@ -43,7 +43,7 @@ The above example will send a header called `X-Token` with the value read from t
 
 If the `my.application.token` is not set then an error will occur creating the client.
 
-It is also possible to pass `Collection<Header>>` or `Headers` object as method arguments as seen below.
+It is also possible to pass `Collection<Header>` or `Headers` object as method arguments as seen below.
 
 .Collection<Header> Argument
 [source,java]