Config documentation update (typo and dsn example) (#107)

* Fix typo (overriden --> overridden)
* Clarify DSN/update example. Fix confusing language for thinking 'url' 
   only contains the protocol, not the full DSN, through a more extensive example.
* Update example with a full DSN

Author: umer936

docs/en/index.rst

@@ -41,10 +41,11 @@ The following configuration should be present in the config array of your **conf
     'Queue' => [
         'default' => [
             // A DSN for your configured backend. default: null
-            'url' => 'redis:',
+            // Can contain protocol/port/username/password or be null if the backend defaults to localhost
+            'url' => 'redis://myusername:mypassword@example.com:1000',
 
             // The queue that will be used for sending messages. default: default
-            // This can be overriden when queuing or processing messages
+            // This can be overridden when queuing or processing messages
             'queue' => 'default',
 
             // The name of a configured logger, default: null