updating ruby example to current version of driver

Author: Andrew Leung

source/administration/ssl.txt

@@ -174,8 +174,8 @@ replica set:
 
 .. code-block:: ruby
 
-   connection = Mongo::ReplSetConnection.new(['localhost', 27017],
-                                             ['localhost', 27018],
+   connection = Mongo::ReplSetConnection.new(['localhost:27017'],
+                                             ['localhost:27018'],
                                              :ssl => true)
 
 Here, :program:`mongod` instance run on "``localhost:27017``" and