GH-268 - Rename actuator endpoint to modulith.

To align with the conventions established by Spring Boot.

spring-modulith-actuator/src/main/java/org/springframework/modulith/actuator/ApplicationModulesEndpoint.java

@@ -32,7 +32,7 @@ import org.springframework.util.function.SingletonSupplier;
  *
  * @author Oliver Drotbohm
  */
-@Endpoint(id = "application-modules")
+@Endpoint(id = "modulith")
 public class ApplicationModulesEndpoint {
 
 	private static final Logger LOGGER = LoggerFactory.getLogger(ApplicationModulesEndpoint.class);