Issue #1108 - adding comment about the purpose of the pristine SSLEngine

Signed-off-by: Joakim Erdfelt <joakim.erdfelt@gmail.com>

jetty-util/src/main/java/org/eclipse/jetty/util/ssl/SslContextFactory.java

@@ -344,6 +344,10 @@ public class SslContextFactory extends AbstractLifeCycle implements Dumpable
     
         try
         {
+            /* Use a pristine SSLEngine (not one from this SslContextFactory).
+             * This will allow for proper detection and identification
+             * of JRE/lib/security/java.security level disabled features
+             */
             SSLEngine sslEngine = SSLContext.getDefault().createSSLEngine();
     
             List<Object> selections = new ArrayList<>();