add Kotlin examples for Spring Data Integration of servlet application

Author: talerngpong

docs/manual/src/docs/asciidoc/_includes/servlet/integrations/data.adoc

@@ -7,17 +7,28 @@ It is not only useful but necessary to include the user in the queries to suppor
 [[data-configuration]]
 === Spring Data & Spring Security Configuration
 
-To use this support, add `org.springframework.security:spring-security-data` dependency and provide a bean of type `SecurityEvaluationContextExtension`.
-In Java Configuration, this would look like:
+To use this support, add `org.springframework.security:spring-security-data` dependency and provide a bean of type `SecurityEvaluationContextExtension`:
 
-[source,java]
+====
+.Java
+[source,java,role="primary"]
 ----
 @Bean
 public SecurityEvaluationContextExtension securityEvaluationContextExtension() {
 	return new SecurityEvaluationContextExtension();
 }
 ----
 
+.Kotlin
+[source,kotlin,role="secondary"]
+----
+@Bean
+fun securityEvaluationContextExtension(): SecurityEvaluationContextExtension {
+	return SecurityEvaluationContextExtension()
+}
+----
+====
+
 In XML Configuration, this would look like:
 
 [source,xml]
@@ -31,7 +42,9 @@ In XML Configuration, this would look like:
 Now Spring Security can be used within your queries.
 For example:
 
-[source,java]
+====
+.Java
+[source,java,role="primary"]
 ----
 @Repository
 public interface MessageRepository extends PagingAndSortingRepository<Message,Long> {
@@ -40,6 +53,17 @@ public interface MessageRepository extends PagingAndSortingRepository<Message,Lo
 }
 ----
 
+.Kotlin
+[source,kotlin,role="secondary"]
+----
+@Repository
+interface MessageRepository : PagingAndSortingRepository<Message,Long> {
+	@Query("select m from Message m where m.to.id = ?#{ principal?.id }")
+	fun findInbox(pageable: Pageable): Page<Message>
+}
+----
+====
+
 This checks to see if the `Authentication.getPrincipal().getId()` is equal to the recipient of the `Message`.
 Note that this example assumes you have customized the principal to be an Object that has an id property.
 By exposing the `SecurityEvaluationContextExtension` bean, all of the <<common-expressions,Common Security Expressions>> are available within the Query.