Update helloworld.md

Author: Dynamsoft-Henry

programming/ios/samples/helloworld.md

@@ -13,7 +13,7 @@ The iOS Helloworld sample illustrates how to create the simplest video streaming
 
 View the samples
 
-- <a href="https://github.com/Dynamsoft/document-normalizer-mobile-samples/tree/main/ios/Objective-C/HelloWorldObjC/" target="_blank">Objective-C (iOS) HelloWorld</a>
-- <a href="https://github.com/Dynamsoft/document-normalizer-mobile-samples/tree/main/ios/Swift/HelloWorldSwift/" target="_blank">Swift (iOS) HelloWorld</a>
+- <a href="https://github.com/Dynamsoft/document-normalizer-mobile-samples/tree/main/ios/Objective-C/HelloWorld/" target="_blank">Objective-C (iOS) HelloWorld</a>
+- <a href="https://github.com/Dynamsoft/document-normalizer-mobile-samples/tree/main/ios/Swift/HelloWorld/" target="_blank">Swift (iOS) HelloWorld</a>
 
 For more details about how to get started with Dynamsoft Document Normalizer, please view the [user guide]({{ site.ios }}user-guide.html).