Address PR feedback

Author: S-Saranya1

services/s3/src/main/java/software/amazon/awssdk/services/s3/S3Utilities.java

@@ -442,6 +442,7 @@ private ClientEndpointProvider clientEndpointProvider(URI overrideEndpoint, Regi
 
         return resolvedOverride
             .map(uri -> ClientEndpointProvider.create(uri, true))
+            // Need an endpoint to marshall but this will be overwritten in modifyHttpRequest
             .orElseGet(() -> ClientEndpointProvider.create(URI.create("https://localhost"), false));
     }
 

services/s3/src/main/java/software/amazon/awssdk/services/s3/internal/signing/DefaultS3Presigner.java

@@ -274,6 +274,7 @@ private SdkClientConfiguration createClientConfiguration() {
                                                 + testEndpoint + ". This is usually caused by an invalid region "
                                                 + "configuration.");
             }
+            // Need an endpoint to marshall but this will be overwritten in modifyHttpRequest
             endpointProvider = ClientEndpointProvider.create(URI.create("https://localhost"), false);
         }