Update AudienceSecretRetrieverTestImpl.java

access-token-provider-api/src/test/java/net/ihe/gazelle/app/accesstokenproviderapi/application/AudienceSecretRetrieverTestImpl.java

@@ -28,6 +28,9 @@ public class AudienceSecretRetrieverTestImpl implements AudienceSecretRetriever
         registry.put(audience, secret);
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public String retrieveSecretForAudience(String audience) {
         return registry.get(audience);