Add engineering mail reference

components/certificate-mgt/org.wso2.carbon.certificate.mgt.core/src/main/java/org/wso2/carbon/certificate/mgt/core/impl/CertificateGenerator.java

@@ -797,7 +797,7 @@ public class CertificateGenerator {
 
             //Reversing the order of components of the subject DN due to Nginx not verifying the client certificate
             //generated by Java using this subject DN.
-            //Ref: https://stackoverflow.com/questions/33769978
+            //Ref: https://stackoverflow.com/questions/33769978 & engineering mail SCEP implementation for Android
             String[] dnParts = certCA.getSubjectDN().getName().split(",");
             StringJoiner joiner = new StringJoiner(",");
             for (int i = (dnParts.length - 1); i >= 0; i--) {