fixed 2 checkstyle errors and ConfigServiceTest.java issue

client/src/main/java/client/utils/Navigation.java

@@ -9,7 +9,7 @@ public class Navigation {
     private final MyFXML myFXML;
     private Pane screen;
 
-    /**
+    /**.
      * Constructs a Navigation Object that uses a fxml object and Pane that will allow to switch UI screens
      * @param x - a MyFXML Object
      * @param y - a Pane Object
@@ -19,7 +19,7 @@ public class Navigation {
         this.screen = y;
     }
 
-    /**
+    /**.
      * The show function takes in an FxmlPath and changes the current pane to the value given by the path
      * using the load function of the myFXML object
      * @param fxmlpath -  FXML path provided to show the next pane

client/src/test/java/client/scenes/ConfigServiceTest.java

@@ -41,7 +41,7 @@ public class ConfigServiceTest {
                 {
                   "language": "de",
                   "serverUrl": "http://exmple12.com",
-                  "favourites": ["banana bread", "pineapple pie"],
+                  "favourites": [23412, 25412],
                   "shoppingList": ["milk", "butter"]
                 }
                 """;