Update application class documentation for clarity

Author: Fabinatix97

captchaservice-backend/src/main/java/de/muenchen/captchaservice/CaptchaServiceApplication.java

@@ -6,7 +6,7 @@
 import org.springframework.scheduling.annotation.EnableScheduling;
 
 /**
- * Application class for starting the microservice.
+ * Application class for starting the Captcha Service application.
  */
 @SpringBootApplication
 @ConfigurationPropertiesScan