Fix typo in ssl example code

Author: jimmy

versioned_docs/version-4.0/ssl/index.md

@@ -838,7 +838,7 @@ public class Example2 {
       ks.load(new FileInputStream("/path/to/client_key.p12"), keyPassphrase);
 
       KeyManagerFactory kmf = KeyManagerFactory.getInstance("SunX509");
-      kmf.init(ks, passphrase);
+      kmf.init(ks, keyPassphrase);
 
       char[] trustPassphrase = "rabbitstore".toCharArray();
       KeyStore tks = KeyStore.getInstance("JKS");