fix OpenStack creation

doc/quick-start.rst

@@ -46,7 +46,8 @@ Only the ``authUrl`` is mandatory to create a client. But you will have to provi
 to each service you create. So it is recommended to provide them when creating the client.
 
 There are different ways to provide the authentication credentials. See the `Token generation`_ section for
-the full list of options.
+the full list of options. You should provide credentials to the `OpenStack` constructor as an array the same way
+you provide options to `generateToken` method of the `Identity` service.
 
 Here is an example of how to create a client with a user id and password:
 

doc/services/identity/v3/index.rst

@@ -5,15 +5,16 @@ Creating the service
 --------------------
 
 Service can be created via `identityV3` method of `OpenStack` object:
+
 .. code-block:: php
+
     $service = $openstack->identityV3();
 
 A list of additional options can be passed to the method. For example, to change the region:
+
 .. code-block:: php
-    $service = $openstack->identityV3(['region' => '{region}']);
 
-Service methods
----------------
+    $service = $openstack->identityV3(['region' => '{region}']);
 
 .. toctree::
   :maxdepth: 3