Fix Kotlin examples in the reference manual

This commit fixes the following issues in the reference manual.

- Remove the dangling opening brace from the Kotlin `PlaceOfBirth`
  example in example-classes.adoc.
- Use `JsonView::class.java.name` instead of
  `JsonView::class.qualifiedName` in the Kotlin examples in
  jackson.adoc, since `qualifiedName` is nullable whereas
  `Model#set()` does not accept a null key.
- Remove unnecessary semicolons after the empty interface bodies in the
  Java examples in jackson.adoc.

Closes gh-37101

Signed-off-by: Tran Ngoc Nhan <ngocnhan.tran1996@gmail.com>

framework-docs/modules/ROOT/pages/core/expressions/example-classes.adoc

@@ -145,7 +145,7 @@ Kotlin::
 ----
 	package org.spring.samples.spel.inventor
 
-	class PlaceOfBirth(var city: String, var country: String? = null) {
+	class PlaceOfBirth(var city: String, var country: String? = null)
 ----
 ======
 

framework-docs/modules/ROOT/pages/web/webflux/controller/ann-methods/jackson.adoc

@@ -32,8 +32,8 @@ Java::
 
 	public class User {
 
-		public interface WithoutPasswordView {};
-		public interface WithPasswordView extends WithoutPasswordView {};
+		public interface WithoutPasswordView {}
+		public interface WithPasswordView extends WithoutPasswordView {}
 
 		private String username;
 		private String password;

framework-docs/modules/ROOT/pages/web/webmvc/mvc-controller/ann-methods/jackson.adoc

@@ -31,8 +31,8 @@ Java::
 
 	public class User {
 
-		public interface WithoutPasswordView {};
-		public interface WithPasswordView extends WithoutPasswordView {};
+		public interface WithoutPasswordView {}
+		public interface WithPasswordView extends WithoutPasswordView {}
 
 		private String username;
 		private String password;
@@ -152,7 +152,7 @@ Kotlin::
 		@GetMapping("/user")
 		fun getUser(model: Model): String {
 			model["user"] = User("eric", "7!jd#h23")
-			model[JsonView::class.qualifiedName] = User.WithoutPasswordView::class.java
+			model[JsonView::class.java.name] = User.WithoutPasswordView::class.java
 			return "userView"
 		}
 	}