JavaV2: Update sns RegistrationExample formatting (#6791)

updated para description for token

Author: scmacdon

javav2/example_code/sns/src/main/java/com/example/sns/RegistrationExample.java

@@ -33,40 +33,43 @@ public class RegistrationExample {
     public static void main(String[] args) {
         final String usage = """
 
-                Usage:     <token> <platformApplicationArn>
+            Usage:     <token> <platformApplicationArn>
 
-                Where:
-                   token - The name of the FIFO topic.\s
-                   platformApplicationArn - The ARN value of platform application. You can get this value from the AWS Management Console.\s
-                """;
+            Where:
+               token - The device token or registration ID of the mobile device. This is a unique 
+               identifier provided by the device platform (e.g., Apple Push Notification Service (APNS) for iOS devices, Firebase Cloud Messaging (FCM) 
+               for Android devices) when the mobile app is registered to receive push notifications.
+
+               platformApplicationArn - The ARN value of platform application. You can get this value from the AWS Management Console.\s
+
+            """;
 
         if (args.length != 2) {
             System.out.println(usage);
-            System.exit(1);
+            return;
         }
 
         String token = args[0];
         String platformApplicationArn = args[1];
         SnsClient snsClient = SnsClient.builder()
-                .region(Region.US_EAST_1)
-                .build();
+            .region(Region.US_EAST_1)
+            .build();
 
         createEndpoint(snsClient, token, platformApplicationArn);
     }
-
     public static void createEndpoint(SnsClient snsClient, String token, String platformApplicationArn) {
         System.out.println("Creating platform endpoint with token " + token);
         try {
             CreatePlatformEndpointRequest endpointRequest = CreatePlatformEndpointRequest.builder()
-                    .token(token)
-                    .platformApplicationArn(platformApplicationArn)
-                    .build();
+                .token(token)
+                .platformApplicationArn(platformApplicationArn)
+                .build();
 
             CreatePlatformEndpointResponse response = snsClient.createPlatformEndpoint(endpointRequest);
             System.out.println("The ARN of the endpoint is " + response.endpointArn());
+
         } catch (SnsException e) {
             System.err.println(e.awsErrorDetails().errorMessage());
-            System.exit(1);
         }
     }
 }