Add missing Kotlin example

See gh-36579

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/data/sql/jdbcclient/MyBean.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2012-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.docs.data.sql.jdbcclient
+
+import org.springframework.jdbc.core.simple.JdbcClient
+import org.springframework.stereotype.Component
+
+@Component
+class MyBean(private val jdbcClient: JdbcClient) {
+
+	fun doSomething() {
+		jdbcClient.sql("delete from customer").update()
+	}
+
+}