docs: mention logging in smallrye-graphql-client

docs/src/main/asciidoc/smallrye-graphql-client.adoc

@@ -200,6 +200,7 @@ public class Planet {
 Now that we have the model classes, we can create the interface that represents the actual set
 of operations we want to call on the remote GraphQL service.
 
+[source,java]
 ----
 @GraphQLClientApi(configKey = "star-wars-typesafe")
 public interface StarWarsClientApi {
@@ -256,6 +257,18 @@ With this REST endpoint included in your application, you can simply send a GET
 and the application will use an injected typesafe client instance to call the remote service, obtain
 the films and planets, and return the JSON representation of the resulting list.
 
+=== Logging
+
+For debugging purpose, it is possible to log the request generated by the typesafe client and the response sent back by the server by changing the log level of the `io.smallrye.graphql.client` category to `TRACE` (see the xref:logging.adoc#configure-the-log-level-category-and-format[Logging guide] for more details about how to configure logging).
+
+This can be achieved by adding the following lines to the `application.properties`:
+
+[source,properties]
+----
+quarkus.log.category."io.smallrye.graphql.client".level=TRACE
+quarkus.log.category."io.smallrye.graphql.client".min-level=TRACE
+----
+
 == Using the Dynamic client
 
 For the dynamic client, the model classes are optional, because we can work with abstract