Change Application Class Name

HelloObservabilityApplication is more correct than HelloMethodApplication.
Also, having different application class names for each sample simplifies
having them all in the same project, if desired.

servlet/spring-boot/java/observability/src/integTest/java/example/HelloMethodApplicationITests.java → servlet/spring-boot/java/observability/src/integTest/java/example/HelloObservabilityApplicationITests.java

@@ -42,7 +42,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @since 5.0
  */
 @SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
-public class HelloMethodApplicationITests {
+public class HelloObservabilityApplicationITests {
 
 	@Autowired
 	TestRestTemplate rest;

servlet/spring-boot/java/observability/src/main/java/example/HelloMethodApplication.java → servlet/spring-boot/java/observability/src/main/java/example/HelloObservabilityApplication.java

@@ -26,10 +26,10 @@ import org.springframework.boot.autoconfigure.SpringBootApplication;
  * @since 5.0
  */
 @SpringBootApplication
-public class HelloMethodApplication {
+public class HelloObservabilityApplication {
 
 	public static void main(String[] args) {
-		SpringApplication.run(HelloMethodApplication.class, args);
+		SpringApplication.run(HelloObservabilityApplication.class, args);
 	}
 
 }

servlet/spring-boot/java/observability/src/test/java/example/HelloMethodApplicationTests.java → servlet/spring-boot/java/observability/src/test/java/example/HelloObservabilityApplicationTests.java

@@ -33,7 +33,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
  */
 @SpringBootTest
 @AutoConfigureMockMvc
-public class HelloMethodApplicationTests {
+public class HelloObservabilityApplicationTests {
 
 	@Autowired
 	MockMvc mvc;