Fix routing chapter of book

Content title and body are not nullable and its setContent, not setRouteContent

Author: jdespatis

book/routing.rst

@@ -478,8 +478,10 @@ follows::
             $content = new StaticContent();
             $content->setParentDocument($dm->find(null, '/cms/content'));
             $content->setName('my-content');
+            $content->setTitle('My Content');
+            $content->setBody('Some Content');
             $dm->persist($content);
-            $route->setRouteContent($content);
+            $route->setContent($content);
 
             // now define an id parameter; do not forget the leading slash if you
             // want /projects/{id} and not /projects{id}
@@ -505,7 +507,7 @@ also ``/projects`` as there is a default for the id parameter.
     doing it in a fixture like this).
 
 Because you defined the ``{id}`` route parameter, your controller can expect an
-``$id`` parameter. Additionally, because you called setRouteContent on the
+``$id`` parameter. Additionally, because you called ``setContent`` on the
 route, your controller can expect the ``$contentDocument`` parameter.
 The content could be used to define an intro section that is the same for each
 project or other shared data. If you don't need content, you can just not set it