fix two little syntax errors

Author: xabbuh

components/event_dispatcher/container_aware_dispatcher.rst

@@ -2,7 +2,7 @@
    single: EventDispatcher; Service container aware
 
 The Container Aware Event Dispatcher
-===================================
+====================================
 
 .. versionadded:: 2.1
     This feature was moved into the EventDispatcher component in Symfony 2.1.

cookbook/profiler/data_collector.rst

@@ -140,6 +140,7 @@ All blocks have access to the ``collector`` object.
     Built-in templates use a base64 encoded image for the toolbar:
 
     .. code-block:: html
+
         <img src="data:image/png;base64,..." />
 
     You can easily calculate the base64 value for an image with this