Mark auto-configuration samples final in spring-boot-docs

See gh-46780

Signed-off-by: Johnny Lim <izeye@naver.com>

documentation/spring-boot-docs/src/main/java/org/springframework/boot/docs/features/developingautoconfiguration/conditionannotations/beanconditions/MyAutoConfiguration.java

@@ -21,11 +21,11 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean
 import org.springframework.context.annotation.Bean;
 
 @AutoConfiguration
-public class MyAutoConfiguration {
+public final class MyAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public SomeService someService() {
+	SomeService someService() {
 		return new SomeService();
 	}
 

documentation/spring-boot-docs/src/main/java/org/springframework/boot/docs/features/developingautoconfiguration/conditionannotations/classconditions/MyAutoConfiguration.java

@@ -24,7 +24,7 @@ import org.springframework.context.annotation.Configuration;
 
 @AutoConfiguration
 // Some conditions ...
-public class MyAutoConfiguration {
+public final class MyAutoConfiguration {
 
 	// Auto-configured beans ...
 

documentation/spring-boot-docs/src/main/java/org/springframework/boot/docs/features/developingautoconfiguration/testing/MyServiceAutoConfiguration.java

@@ -27,11 +27,11 @@ import org.springframework.context.annotation.Bean;
 @AutoConfiguration
 @ConditionalOnClass(MyService.class)
 @EnableConfigurationProperties(UserProperties.class)
-public class MyServiceAutoConfiguration {
+public final class MyServiceAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public MyService userService(UserProperties properties) {
+	MyService userService(UserProperties properties) {
 		return new MyService(properties.getName());
 	}