Fix checkstyle errors

samples/boot/minimal/src/main/java/sample/MinimalAuthorizationServerApplication.java

@@ -21,7 +21,8 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
 @SpringBootApplication
 public class MinimalAuthorizationServerApplication {
 
-    public static void main(String[] args) {
-        SpringApplication.run(MinimalAuthorizationServerApplication.class, args);
-    }
+	public static void main(String[] args) {
+		SpringApplication.run(MinimalAuthorizationServerApplication.class, args);
+	}
+
 }

samples/boot/minimal/src/test/java/sample/MinimalAuthorizationServerApplicationTests.java

@@ -24,8 +24,9 @@ import static org.assertj.core.api.Assertions.assertThat;
 @SpringBootTest
 public class MinimalAuthorizationServerApplicationTests {
 
-    @Test
-    public void loadContext(ApplicationContext context) {
-        assertThat(context).isNotNull();
-    }
+	@Test
+	public void loadContext(ApplicationContext context) {
+		assertThat(context).isNotNull();
+	}
+
 }