Main.java: Replace Duke reference with Devon

Update the comment in Main.java to correctly refer to the class as Devon instead of Duke.

The previous comment referred to Duke, which could lead to confusion when reading the code. Changing this ensures that the codebase accurately reflects the current state of the project.

No other functionality is affected by this change, as it is purely a documentation update.

src/main/java/devon/Main.java

@@ -21,7 +21,7 @@ public void start(Stage stage) {
             AnchorPane ap = fxmlLoader.load();
             Scene scene = new Scene(ap);
             stage.setScene(scene);
-            fxmlLoader.<MainWindow>getController().setDevon(devon); // inject the Duke instance
+            fxmlLoader.<MainWindow>getController().setDevon(devon); // inject the Devon instance
             stage.show();
         } catch (IOException e) {
             e.printStackTrace();