fix a typo

Author: xabbuh

cookbook/bundles/installation.rst

@@ -73,7 +73,7 @@ The only thing you need to do now is register the bundle in ``AppKernel``::
 
 In a few rare cases, you may want a bundle to be *only* enabled in the development
 :doc:`environment </cookbook/configuration/environments>`. For example,
-the DoctrineFixturesBundle helps load dummy data - something you probably
+the DoctrineFixturesBundle helps to load dummy data - something you probably
 only want to do while developing. To only load this bundle in the ``dev``
 and ``test`` environments, register the bundle in this way::