Remove two public methods

Author: belugabehr

core/arns/src/main/java/software/amazon/awssdk/arns/Arn.java

@@ -151,10 +151,7 @@ public static Builder builder() {
      */
     public static Arn fromString(String arn) {
         Validate.paramNotBlank(arn, "arn");
-        return parseString(arn);
-    }
 
-    public static Arn parseString(String arn) {
         int arnColonIndex = arn.indexOf(':');
         if (arnColonIndex < 0 || !"arn".equals(arn.substring(0, arnColonIndex))) {
             throw new IllegalArgumentException("Malformed ARN. Missing 'arn:' prefix: " + arn);