Update WithExample_pre.jpage

updated NonNull check

website/usageExamples/WithExample_pre.jpage

@@ -6,8 +6,7 @@ public class WithExample {
 	@With(AccessLevel.PROTECTED) @NonNull private final String name;
 	@With private final int age;
 	
-	public WithExample(String name, int age) {
-		if (name == null) throw new NullPointerException();
+	public WithExample(@NonNull String name, int age) {
 		this.name = name;
 		this.age = age;
 	}