Fix example of replication.

examples/MasterSlaveReplication.php

@@ -23,7 +23,7 @@ require 'SharedConfigurations.php';
 
 $parameters = array(
     'tcp://127.0.0.1:6379?database=15&alias=master',
-    'tcp://127.0.0.1:6379?database=15&alias=slave',
+    'tcp://127.0.0.1:6380?database=15&alias=slave',
 );
 
 $options = array('replication' => true);