[clean] Removed a no longer needed comment

Author: bogdansolga

d02/d02s02/d02s02e03-config-per-profile/src/main/java/net/safedata/spring/training/d02/s02/ProfileConfigDemo.java

@@ -16,7 +16,6 @@ public class ProfileConfigDemo {
     public static void main(String[] args) {
         final SpringApplication springApplication = new SpringApplication(ProfileConfigDemo.class);
 
-        // running without a profile will throw an exception, as the property doesn't exist in the default config
         springApplication.setAdditionalProfiles(Profiles.DEV);
 
         springApplication.run(args);