[#2854] One more small fix thanks to @xabbuh

Author: weaverryan

book/routing.rst

@@ -1223,7 +1223,7 @@ Generating URLs with Query Strings
 The ``generate`` method takes an array of wildcard values to generate the URI.
 But if you pass extra ones, they will be added to the URI as a query string::
 
-    $this-get('router')->generate('blog', array('page' => 2, 'category' => 'Symfony'));
+    $this->get('router')->generate('blog', array('page' => 2, 'category' => 'Symfony'));
     // /blog/2?category=Symfony
 
 Generating URLs from a template