Added note on anonymous credentials usage for GetBucketRegion

Signed-off-by: Tiger Kaovilai <[email protected]>

feature/s3/manager/bucket_region.go

@@ -17,7 +17,7 @@ const bucketRegionHeader = "X-Amz-Bucket-Region"
 // GetBucketRegion will attempt to get the region for a bucket using the
 // client's configured region to determine which AWS partition to perform the query on.
 //
-// The request will not be signed, and will not use your AWS credentials.
+// The request will not be signed.
 //
 // A BucketNotFound error will be returned if the bucket does not exist in the
 // AWS partition the client region belongs to.
@@ -60,6 +60,14 @@ const bucketRegionHeader = "X-Amz-Bucket-Region"
 //	if err != nil {
 //		panic(err)
 //	}
+// 
+// If buckets are public, you may use anonymous credential like so.
+// 	manager.GetBucketRegion(ctx, s3.NewFromConfig(cfg), bucket, func(o *s3.Options) {
+//	     o.Credentials = nil
+//	     // Or
+//	     o.Credentials = aws.AnonymousCredentials{}
+//	})
+// Otherwise credentials would be required for private buckets.
 func GetBucketRegion(ctx context.Context, client HeadBucketAPIClient, bucket string, optFns ...func(*s3.Options)) (string, error) {
 	var captureBucketRegion deserializeBucketRegion