Fix Javadoc of QuarkusTestResourceLifecycleManager's start method

Relates to: https://quarkusio.zulipchat.com/#narrow/stream/187030-users/topic/QuarkusTestResourceLifecylceManager/near/289446358

Co-authored-by: Jérémie Bresson <dev@jmini.fr>

test-framework/common/src/main/java/io/quarkus/test/common/QuarkusTestResourceLifecycleManager.java

@@ -28,7 +28,7 @@ public interface QuarkusTestResourceLifecycleManager {
     /**
      * Start the test resource.
      *
-     * @return A map of system properties that should be set for the running test
+     * @return A map of configuration properties that will be set for the running test
      */
     Map<String, String> start();